9 Best Emergency Water Filters for Survival (November 2023)

In most parts of the US, we’re very fortunate to have easy access to tap water that’s safe to drink. But you never know when your water safety or quality might be compromised. If you’ve arrived at this guide, you already know that. You’re looking for the best emergency water filter, and we’re here to help. 

In all, we tested and reviewed over 20 emergency filters with untreated lake & river water, and the 9 featured below are the only ones we would trust 100%.

We’ve ranked the emergency filters on this list in order of reliability and effectiveness. If your only drinking source has been compromised by potentially dangerous contaminants, reliability is absolutely the most important feature of any emergency water filter. We also considered cost, durability, and ease of use, amongst other features, when deciding which emergency water filters are the best value for money.

🥇 Best Survival Water Filters

• Best Overall: PortaWell
• Best Gravity Fed: ProOne Big+ Gravity Water Filter
• Best Filtered Bottle: Grayl GeoPress
• Runner Up Gravity Fed: Epic Nano Water Filter Dispenser
• Runner Up Bottle: Water-to-Go Filtered Bottle
• Most Portable: Sawyer MINI Water Filtration System
• Runner Up Pump System: MSR MiniWorks EX Microfilter Water Filter
• Alternate Gravity Fed Option: Platypus Gravity Water Filter
• Easy to Use: LifeStraw Personal Water Filter

📊 Comparison Chart of Emergency Water Filters

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🏷️ The Best Emergency Water Filters in the News: The Latest Deals and Discounts

Here, we’ve shared the latest news, deals, and discounts that will help you get the best price on the emergency filters featured here. It’s worth checking back here regularly – we update this section whenever we catch wind of a seasonal sale or we have a unique discount code to share for a particular filter. 

• 25 percent off on all ProOne products until December 31st
• Get 25% off on your filtered water bottle with Water-to-Go’s Black Friday deals
• Save 25% off on Lifestraw’s Holiday Favorites

⭐ Reviews – Best Survival Water Filter 2023

Best Overall

Our Rating: 5/5

★★★★★

How We Review

PortaWell

In our opinion, the PortaWell is a the best overall survival water filter available today. This high-volume portable water filter uses a battery-operated pump and can filter water at a rate of 40-60 gallons per hour, removing 100% cysts and more than 99.9% pathogenic bacteria.

View at myportawell.com

Specs

rice	$359
Type	Pump dual filtration
Filter Capacity	Varies by cartridge
Pathogen Removal	Bacteria, Viruses, Cysts
Contaminants Removed	200+
Certifications or Testing	Ceramic Filter: NSF 42
Process	Mechanical + Carbon + Ceramic
Annual Cost	Varies
Warranty	1 year

Our PortaWell system was shipped with three filters, but there’s space for only two filters in the unit itself. That meant we could mix and match, choosing the best pair of filters for our situation (or using all three by filtering the same batch of water twice and swapping a filter before the second run-through). Also included was the pump itself (which is battery-operated), and a 5-gallon bucket to collect the water. The battery is sold separately – it costs around $40 on the PortaWell website. This was our only gripe with the system’s design; we think it should be included in the purchase given it’s essential for the pump’s operation. 

When we got the PortaWell Filtration System, it cost around $329, so it’s not the most budget-friendly emergency filter. But, it offers a much more thorough purification solution than many of the other systems we tested, with its three dedicated filter stages, and it produces filtered water at a much faster rate than the handheld alternatives – so we felt we’d get superior water treatment that justified the higher upfront cost.

Best For: 

Anyone looking for a fast, convenient emergency water filtration solution that’s easy to transport and store and provides purified drinking water for groups or families.

Remove Tens Of Contaminants With Three Dedicated Filter Stages

Our biggest priority in any emergency water filter was to remove microorganisms – and the PortaWell ticked our boxes with its ability to remove pathogenic bacteria and cysts. But, unlike many of the other emergency filters we tested, microorganisms aren’t the only contaminants that this filtration system targets. With multiple separate filter cartridges, it also reduces or removes pesticides and herbicides, volatile organic chemicals, pesticides, chlorine, sediment, and more. 

Most pump filters use just one or two filter stages, but the PortaWell Filtration System has three: a 1-micron sediment filter, a carbon block filter, and a 0.5-micron absolute ceramic filter. As we mentioned, you can only use two filters at a time in the system, and we enjoyed being able to mix and match the different filters for different purposes: the sediment and absolute ceramic filters were an ideal combination for treating surface water containing pathogenic bacteria and sediment, and we could then swap the ceramic filter for the carbon block filter to also target pesticides, herbicides, chlorine, and contaminants affecting taste and odor. We know that some folks might find it a hassle having to swap out the filters, but we were glad to have a dedicated sediment filter that we could use to remove large particulates from natural water sources without having to DIY our own makeshift filter for this purpose. If you’re filtering a low-sediment tap water source, you can simply ignore the sediment filter and use the ceramic and carbon filters together. 

Filters Water With A Battery Pump

We found the PortaWell system a little more time-consuming to set up than some of the more basic emergency filters we reviewed. We had to organize and connect the tubes, battery, filters, bucket, and cables before we could even begin the filtration process. But the good news was that once the assembly and setup were complete, we didn’t have to lift a finger because the pump is battery-operated. No hand-pumping required!

The fact that the pump uses battery power also meant that we had much faster access to safe, clean water than most of the gravity systems we tried. The pump has a fast filtered water flow rate of 40-60 GPH, and we found that we were able to filter 1 gallon of water in just over a minute – that’s around 2.5 times the filtration speed of a hand-pump system. We found it convenient to be able to collect water in the roomy 5-gallon bucket before transferring it to other containers. We will say, however, that with a weight of just under 15 pounds, it’s not the best solution if you’re packing light. We pictured this as a great option to store in a cupboard or a survival stash for emergency use. 

It was reassuring to know that the filters are designed to last a long time. The carbon and sediment filters have a 1,000-gallon lifespan, while the ceramic filter can filter up to 10,000 gallons and could be renewed when necessary – we just washed it under running water to clear the debris. 

Read the full review: Portawell Review (Updated for 2023)

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Best Gravity Fed

Our Rating: 5/5

★★★★★

How We Review

ProOne Big+

The ProOne Big+ is our top pick as the best gravity-fed emergency water filtration solution. This durable stainless steel countertop filter can remove more than 270 impurities, including chlorine, fluoride, lead, VOCs, bacteria, and protozoa – and it doesn’t use electricity or water pressure, so it can be used in emergency situations where these might not be available.

View at prooneusa.com

Specs

Price	229.95+
Type	Gravity
Filter Capacity	1,200 gallons/filter
Pathogen Removal	Bacteria, Viruses, Microbial Cysts
Contaminants Removed	200+
Certifications or Testing	NSF 42, 53, P231
Process	Ceramic filter media
Annual Cost	~$100
Warranty	5-year limited warranty (Stainless steel unit), 1-year limited warranty (ProOne® G2.0)

Our first impressions of the ProOne Big+ were that it has one obvious convenience compared to the PortaWell system: it’s a gravity filter, so we wouldn’t have to worry about having a charged battery to use in an emergency situation. Instead, the unit uses the ever-reliable force of gravity to send water down through a ceramic filter (or filters) and into the bottom chamber, where it can be dispensed for drinking. However, this difference did mean that we wouldn’t be able to access large batches of filtered water very quickly in an emergency scenario because of the slow-and-steady rate of gravity filtration. The great thing about the Big+ is that it’s designed to treat both potable and non-potable water sources, so we could use it for everyday filtration and on an emergency basis. 

Pricing for this system varies depending on how many filter elements you buy (it can fit up to 3). The unit with a polished stainless steel finish and a single G2.0 7-inch filter element costs $229.95. We chose to upgrade to the unit with 2 filters, which meant we’d be able to filter more water at once. If you want an emergency water filter solution for a big group or family, our advice is to go for the unit with 3 G2.0 9-inch filter elements, which costs around $370. We estimated we’d spend less than $100 annually on maintenance, assuming that we’d only have to replace the filters once a year.

ProOne Big+ Options	Price (Polished)	Price (Brushed)
1 G2.07 Filter Element	$229.95	$239.95
2 G2.07 Filter Element	$289.95	$299.95
3 G2.09 Filter Element	$369.95	$379.95

Best For:

Anyone looking for a water filter that filters big batches of water for emergency use and produces clean, great-tasting water regardless of the source.

Easy To Assemble & Use

Facing an emergency scenario is stressful enough, and the last thing you want is the extra stress of having to work out how to assemble and use a complex system. We found that the Big+ was one of the best systems we tested when it came to ease of assembly and use, taking us less than 20 minutes to set up following the 5-step assembly instructions in the user manual. 

Using the system was also a piece of cake: we just poured water into the upper chamber and waited for it to filter through into the bottom. We felt particularly reassured by the system’s gravity-fed filtration process – no matter the emergency scenario, gravity will always exist, which meant we knew we’d be able to use the system in all situations as long as we had access to a water source. This didn’t need to be water from the tap, either, since the Big+ can be used to filter natural water sources, so we could use it to filter water from a stream or river if necessary. 

Yes, gravity filtration is pretty slow and steady (with our two 7-inch filters, we noted a filtration speed of around 0.52 gallons per hour – much slower than the 40-60 GPH filtration speed). But because the unit holds 3 gallons of water, we found it easy and low-effort to fill the top chamber and simply leave it to filter water over the next 5-6 hours. We could dispense water from the spigot while it was filtering, so we didn’t have to wait for a full batch of water to filter first. 

Superior 200+ Contaminant Removal

Like the PortaWell system, the ProOne Big+ has the advantage of removing more than just microorganisms. It has been third-party tested to NSF Standards 42, 53, P231, P401, and P473 to remove 200+ contaminants, so it’s a great choice for anyone who’s looking for the most thorough water filtration solution, helping to not only make water safe to drink, but also improving its quality, taste, and smell. 

We were able to test our own water supply before and after using the Big+ to see exactly what it was capable of removing. We filtered untreated water from a river in Colorado through the system, and our test results showed that the ProOne completely removed all bacteria from this water source, including E. coli, Enterococcus, and total coliform. The filters also eliminated manganese and aluminum, reduced sulfate by 35%, and removed 80% of the water’s iron content. We also tested the system’s ability to remove a different set of contaminants from our city water source, and it removed 100% of lead, aluminum, copper, fluoride, and manganese. It also reduced the two disinfection byproducts present in the water by around 50%. 

Learn more about the contaminants removed by the ProOne Big+ with our third-party laboratory analysis below.

Read the full review: ProOne Big Review

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Best Filtered Bottle

Our Rating: 4.5/5

★★★★★

How We Review

Grayl GeoPress

Based on our testing, the Grayl GeoPress is the best filtered water bottle you can buy for emergency use. This BPA-free 710 ml water filter bottle impressed us with its ability to eliminate up to 99.99% of viruses, bacteria, and protozoa, as well as particulates (including sediment and microplastics), heavy metals like arsenic and lead, VOCs, and chemicals like benzene and chloroform. Plus, we found it super simple to use, with a press design rather than a built-in straw filter.

View at grayl.com

View at rei.com

Specs

Price	$99.95
Type	Bottle
Filter Capacity	55 gallons
Pathogen Removal	Bacteria, Viruses, Cysts
Contaminants Removed	15+
Certifications or Testing	NSF/ANSI 42 & 53
Process	Electroadsorptive Activated Carbon + Ion Exchange
Annual Cost	~$180
Warranty	10 years

In terms of appearance and design functionality, the Grayl GeoPress was exactly what we were looking for in a personal emergency water filter. The bottle is slim and compact, and we could easily store it in a cupboard or emergency survival kit, but it holds a decent amount of water (750ml). It has a sturdy, durable feel and withstood our bump and drop tests without getting cracked or dented, and the non-slip rubber grips meant it was easy to carry, even when full. Weighing around 15.9 ounces without any water, it’s not the lightest emergency water filter we’ve tried, but it’s also not disruptively heavy or bulky. 

We went for the Nature Edition bottle, which cost around $100. We’ve tested cheaper filtered water bottles, but the Grayl GeoPress outshone them all as being the best at removing the broadest range of contaminants, including viruses – exactly what we want to see in an emergency water filtration solution. We expected to spend $70-$80 annually on filter changes. 

Best For:

Folks looking for a personal emergency water filtration solution that they can take with them on the go for low-hassle purification of their drinking supply.

Press Bottle Filtration

The Grayl GeoPress is a press bottle filter, meaning that the force of pressing the bottle sends water through the filter, which traps contaminants. Personally, we prefer a press bottle filter to a bottle with a straw filter, since press bottles eliminate the difficulty of sucking water through a straw filter. We didn’t have to fuss around with setup – we simply filled the bottle with water from a nearby stream, placed it on a flat surface, put the lid on, and pressed the top of the bottle downwards to send water through the filter. We could filter an entire batch of water in less than 10 seconds, rather than having to filter water gradually every time we sucked through a straw, and the process of pressing down on the bottle wasn’t too strenuous thanks to the vented bottle cap. 

With its wide-neck design, the Grayl GeoPress is easy to clean between uses. It lasts up to 350 presses – plenty to carry you through in an emergency situation. However, the filter lifespan depends on the quality of the water you’re filtering, and to stay on the safe side, we filtered our dirtier water sources through a DIY cloth filter to get rid of the sediment before using them to fill the GeoPress bottle. 

Impressive Contaminant Removal

Many of the water bottle filters we’ve tested can either remove microorganisms or remove chlorine, tastes, and odors. The GeoPress is one of the few filters of its kind that can be used to make microbiologically contaminated water safe to drink and remove chemicals, metals, and tastes, improving overall water quality. This bottle filter combines powdered activated carbon and ion exchange media, which can remove bacteria, viruses, protozoa, sediment, microplastics, heavy metals, PFAS, VOCs, and some chemicals. We were particularly impressed with the filter’s ability to remove viruses, since only around 20-30% of filters for emergency purposes can remove this tiny contaminant. While water sources in the U.S. rarely get contaminated with viruses, we felt reassured to know that we’d be protected against viruses in any hypothetical emergency situation. We noticed an improvement in our water’s taste after using the UltraPress to filter water from a natural source – something that only carbon filtration can achieve. 

Grayl’s filter performance claims are supported by third-party laboratory testing in accordance with NSF Standards 42 and 53, for the removal of sediment, chemicals, and pathogens, and the UltraPress filter also meets the U.S. Environmental Protection Agency’s protocols for for microbiological water purifiers, offering the reassurance of industry-standard water treatment. 

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Runner Up Gravity Fed

Our Rating: 4.5/5

★★★★★

How We Review

Epic Nano Water Filter Dispenser

The Epic Nano is our runner-up gravity-fed filter, taking second place to the ProOne Big+. This countertop water dispenser capable of filtering up to 99.999% of more than 200 common drinking water contaminants, including viruses and bacteria.

Discount: Get 20% off at epicwaterfilters.com – Click Here for Code

View at epicwaterfilters.com

Specs

Price	$75
Type	Gravity
Filter Capacity	150 gallons
Pathogen Removal	Bacteria, Viruses, Cysts
Contaminants Removed	200+
Certifications or Testing	NSF 42, 53, 401, P473, and P231
Process	Mechanical + Electroadhesion + Ion Exchange
Annual Cost	~$140
Warranty	Lifetime

The Epic Nano is another filter that’s ideal for group use as an emergency filtration system. It’s a relatively large dispenser unit, so it’s a great static filtration solution – but it’s not going to fit in a backpack or bag. Like the ProOne Big+, the Nano dispenser uses gravity to send water through a filter, and the filtered water collects in the bottom reservoir, where it can be dispensed for drinking. Aside from a few obvious design differences (the Nano is made from BPA-free plastic, holds 1.7 gallons of filtered water, and is cube-shaped, while the Big+ is made from stainless steel, holds 3 gallons of filtered water, and is cylindrical-shaped), the systems both offer a very similar performance. 

When we tested the Epic Nano Dispenser, it had an upfront cost of $60 – so it’s significantly cheaper than the Big+. But its filter lifespan of up to 150 gallons is also much lower. While we only expected to replace the filters in the Big+ once a year, we were looking at at least 4 filter changes a year with the Nano dispenser (we expected to spend around $50 annually on maintenance).

Best For: 

Families and groups who want an affordable, no-fuss emergency gravity filtration system that removes microorganisms, chemicals, heavy metals, and more, making even dirty water safe to drink.

Simple, Effective Gravity Filtration Process

Of all those we tested, the Epic Nano was hands-down the easiest emergency water filter to set up and use. Out of the box, it has a super simple design, with no fiddly parts or complicated filter priming requirements. We simply rinsed the shell and reservoir in warm, soapy water, assembled the top reservoir on the bottom, filled the dispenser, then discarded the first batch of water. We reckon most people should find this process really easy to follow, even if you’re slightly frazzled during an emergency scenario. 

The Nano dispenser is one of the only dispensers we’ve found that can remove microorganisms, including viruses, so it’s ideal for emergencies where you don’t know how your drinking water quality might have been compromised. But it doesn’t only target pathogens like some filters – it also reduces or removes chemicals, heavy metals, pesticides, pharmaceuticals, and more. Some of the contaminants the filter has been third-party tested to remove include Virus MS2 Phage (99.95%), E.Coli (99.9999%), giardia (99.909%), cryptosporidium (99.999%), lead (99.4%), chromium-6 (96.6%), and fluoride (68%). 

Because it can remove common drinking water contaminants as well as making water potable, the Nano dispenser can be used as an everyday water filter system and emergency purification solution. If you do choose to use the system every day, you’ll appreciate the built-in countdown timer, which tells you when to replace the filter based on how long you’ve used it. It was important to us that the filter worked reliably to remove pathogens and other contaminants from our water, so we felt reassured that we wouldn’t unintentionally use the filter beyond the end of its lifespan. 

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Runner Up Bottle

Our Rating: 4/5

★★★★★

How We Review

Water-to-Go Filtered Bottle

The Water-to-Go Filtered Bottle, our runner-up bottle filter for emergency use, is a filtered water purifier bottle that comes in two different BPA-free styles and sizes. Using 3-in-1 filter technology, this filter is one of the best water filters in a bottle for producing clean, potable water on the go, removing more than 99.99% of all microbiological contaminants.

View at watertogousa.com

Specs

rice	$95.98
Type	Bottle
Filter Capacity	52 gallons
Pathogen Removal	Cysts Bacteria, Viruses, Cysts
Contaminants Removed	99% of all Biologicals
Certifications or Testing	USEPA Guide Standard (1986) and Protocol for Testing Microbiological Water Purifiers
Process	Electroadhesion + Ion Exchange Mechanical + Carbon Electroadhesion
Annual Cost	~$100
Warranty	–

Comparing the Water-To-Go Bottle Filter with our top pick bottle, the Grayl GeoPress, there are a few distinct differences to mention: the Water-To-Go Bottle Filter uses a straw filter rather than push filtration, and it has a shorter filter lifespan of 2-3 months. But they have a lot of similarities, too: there’s only around a $5 difference between them price-wise, and they have similar holding capacities (the Water-To-Go bottle holds 750ml, while the GeoPress bottle holds 710ml). Plus, they both remove bacteria and viruses, alongside other microorganisms. The Water-To-Go bottle is our second pick because of its shorter lifespan and the fact that we find straw filter bottles more difficult to use. 

Price-wise, we got the Water-To-Go Bottle Filter when it cost around $96. The bottle comes with 3 filters, which softens the blow of having to replace the filters every 2-3 months. If you only plan to use the bottle in an emergency scenario, you’ll appreciate being able to store a stash of multiple filters to use as and when needed. Even with more filters to change, if we were to use the bottle regularly, we’d expect to spend less than $100 on annual maintenance. 

Best For:

People who want an affordable, reliable emergency personal water filter that uses straw filtration and comes with three filters with the initial purchase of the bottle. 

NASA-Approved Filtration Technology

The Water-To-Go Bottle Filter uses 3-in-1 filter technology ( which was originally created for NASA!) to reliably remove 99.9999% of all microbiological contaminants. The three filter stages are mechanical filtration (using tiny pores to trap contaminants as small as pathogens), electrical filtration (which uses a positive charge to attract and trap minuscule contaminants, and further reduces the pore size), and activated carbon (which uses adsorption to address chemicals, tastes, and odors in water). Some of the contaminants targeted are bacteria and viruses like E. Coli, Hepatitis A, and Typhus; parasites like tapeworm and threadworm, microplastics, metals like mercury, and chemicals like fluoride, chlorine, and VOCs.

These three complex filter processes are packed into a small filter, which is attached to a straw – which, in turn, is attached to the underside of the lid. When we drank through the mouthpiece on the bottle lid, the force drew water up through the filter before traveling up and out of the straw.  There’s a lid that protects the mouthpiece when the bottle isn’t in use, and while the older Water-To-Go bottles were known for leaking, a 2020 design update meant that we didn’t have any issues with leaking from the lid of our newer bottle. We found the bottle too big to fit in the outside pockets of a rucksack, but you could still easily pack it in an emergency pack or suitcase without it taking up too much room or weighing your pack down. 

Read the full review: Water-to-Go Filtered Water Bottle Review

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Most Portable

Our Rating: 4/5

★★★★★

How We Review

Sawyer MINI Water Filtration System

The Sawyer MINI is up there with the best water purification solutions offered by the well-known survival filter brand, Sawyer Products, and is our top recommended emergency water filter for portability. This versatile personal filter removes more than 99.99% of protozoa and bacteria and is small and compact enough to fit in even the smallest emergency preparedness kit.

View at rei.com

View at moosejaw.com

View on Amazon

View at Walmart

Specs

Price	$24.95
Type	Straw
Filter Capacity	100,000 gallons
Pathogen Removal	Protozoa, Bacteria
Contaminants Removed	99% of all Biologicals
Certifications or Testing	USEPA Guide Standard (1986) and Protocol for Testing Microbiological Water Purifiers
Process	Hollow Fiber Membrane
Annual Cost	–
Warranty	Lifetime

The Sawyer MINI Water Filtration System is the best multi-functional emergency water filter we’ve tested. Regardless of the emergency you’re facing, you should be able to find the most convenient use for this filter – whether that’s screwed onto a disposable water bottle, attached to a hydration pack or the included drinking pouch, or used as a straw to drink directly from water sources. The filter is small and lightweight, and it required minimal effort in our testing, making it the best solution for fast, easy access to clean drinking water. 

We got the MINI system when it cost just under $25 – an unbeatable price given that the filter lasts up to 100,000 gallons and has an indefinite shelf life. That means the filter can be stored for as long as necessary as an emergency water treatment solution that you can rely on whether you use it next year, in the next 10 years, or 50 years down the line. 

Best For:

Anyone looking for the most portable solution for filtering water in emergency situations, which won’t take up precious storage space and has various use cases to suit different preferences.

Versatile Hollow-Fiber Emergency Filtration

We know that different folks prefer to be able to use their emergency filter in different ways, and the appeal of the Sawyer MINI system is that it has multiple configurations, so you can find what works best for you. Our favorite option was to use the filter while attached to a plastic water bottle: we just filled the bottle with our available water source, then squeezed it to power water through the filter, where we could drink directly or fill a container or another bottle for later. We think this method is one of the easiest for an emergency situation, but we could also use the squeeze bag for the same purpose (a good option if you don’t have access to water bottles). On average, the speed of filtration with this method was around half a liter of filtered water per minute. 

Another method that we tried was drinking straight from the water source using the included straw, and we thought this was also fast and convenient for emergencies, requiring no extra kit – although it wasn’t as easy as using the squeeze function. On its own, the MINI filter weighs just 2 ounces, so we could stash it in our small, portable emergency kit without it dominating the space. 

The Sawyer MINI uses a 0.1-micron hollow-fiber membrane filter, which can trap both bacteria and protozoa, including Giardia and Cryptosporidium, but not viruses. We found that it works best when treating clear water. However, we could still use it for turbid water – it just clogged faster, so we had to backwash it more frequently with the included syringe. 

Read the full review: Sawyer MINI Water Filter Review

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Runner Up Pump System

Our Rating: 4/5

★★★★★

How We Review

MSR MiniWorks EX Microfilter Water Filter

Based on our testing, the MSR MiniWorks EX Microfilter Water Filter is our runner-up pump filter for emergency use, taking second place to the PortaWell pump system. This MiniWorks model is a smaller and more compact alternative to the PortaWell, with just one filter cartridge and a hand-pump design.

View at msrgear.com

View at rei.com

View on Amazon

Specs

Price	$119.95
Type	Pump
Filter Capacity	2000 liters
Pathogen Removal	Protozoa, Bacteria
Contaminants Removed	99% of all Biologicals
Certifications or Testing	NSF P231
Process	Ceramic + Carbon
Annual Cost	~$40
Warranty	Limited Lifetime

Straight away, the obvious difference between this MSR pump filter and the PortaWell system is size. The MiniWorks system weighs just 16 ounces and can be comfortably held in one hand. It’s a hand-pump system, which meant we had to put in the work to manually pump water through the ceramic carbon filter. Of all the filters we tested, the MiniWorks felt particularly durable, so we had faith that it would serve us reliably as an emergency water filter, even with unintentional rough handling. 

Since it only uses one filter, has a basic design, and doesn’t require a battery, the cost of this MSR pump filter is significantly cheaper than the PortaWell ($120 versus the PortaWell’s $329). Included in our box were the pump, the ceramic filter, and the optional water collection bag. We anticipated that our annual spend on filter maintenance would be less than $40. 

Best For:

Folks who prefer the speed and filtration capacity of a pump filter and specifically want a hand-pump filter that won’t let them down if they don’t have access to electricity.

Reliable Hand-Pump Filtration

The MiniWorks EX Microfilter is one of the longest-standing filters on the market – we know some folks who have used the filter for more than 20 years. That’s why we wanted to review this filter as an alternative pump system for people looking for a failsafe and reliable system that doesn’t rely on a charged battery (which you might not have access to in an emergency situation). 

The filter consists of ceramic and charcoal carbon block media, with a 0.2-micron pore size. It meets NSF protocol P231 for 99.9% protozoa removal and 99.9999% bacteria removal, even in “worst-case” water, throughout its lifespan. Plus, like the PortaWell pump filter, it also reduces pesticides, tastes, odors, and chemicals, thanks to its carbon core. 

We assembled the filter and got set up for filtering water in just a few minutes. This involved placing the hose end in a water source and pumping the device to send water into the attached bag (or a water bottle of your choice). We found the actual manual pumping process fairly easy, but we noticed that the advertised 1-liter-per-minute filtration speed slowed the longer we pumped, so we ended up producing 1 liter of filtered water in around 80-90 seconds. This filtration speed doesn’t match up to the PortaWell, with its battery-powered operation, which produces up to 60 gallons of water per hour. Still, we think the MiniWorks pump is fast enough to provide plenty of water for 1-3 people in an emergency situation, and because it’s manually operated, it’s more reliable on the whole. 

A feature we love about this filter is that it has a washable and reusable design, so we knew we’d be able to clean and renew it if we used it on multiple occasions. Unlike with similar systems, we didn’t need to backwash the filter – we could just clean away the dirt with a sponge. The filter is rated to last up to 2,000 liters, or around 528 gallons. That’s not as long as the PortaWell filter lifespan (1,000-10,000 gallons, depending on the filter), but it’s still plenty for occasional or emergency use. 

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Alternate Gravity Fed Option

Our Rating: 4.5/5

★★★★★

How We Review

Platypus Gravity Water Filter

The Platypus is our alternative gravity fed option for emergency or survival situations. It’s a hanging bag gravity water purifier with a 0. 2 micron filter that can trap 99% of microorganisms like bacteria and cysts.

View at platy.com

View at rei.com

View on Amazon

Specs

Price	$134.95
Type	Gravity
Filter Capacity	1,500 gallons
Pathogen Removal	Protozoa, Bacteria
Contaminants Removed	99% of all Biologicals
Certifications or Testing	EPA/NSF
Process	Hollow Fiber Membrane
Annual Cost	~$70
Warranty	Lifetime

Our first impressions of the Platypus Gravity Water Filter were that it’s smaller and more portable than the ProOne Big+ and Epic Nano systems, using two bags connected by tubing and an inline filter. The idea is that you hang the “dirty” water storage bag from a high point (like a tree branch), and water will flow through the filter and into the “clean” storage bag. With its small size and lightweight 11.45-ounce build, we identified this system as being the best gravity filter for taking on the go or storing in a small emergency kit. 

When we reviewed the system, it cost around $135 upfront. That puts it in the middle ground, price-wise, between the Big+ and Nano Dispenser gravity systems. It’s more expensive than similar hanging gravity filters, but we think the price is justified because of its high 6-liter water-holding capacity and thick, high-quality storage bags that should withstand years of storage or use. We estimated we’d spend less than $70 on annual maintenance. 

Best For:

Families or groups who want a dedicated high-capacity hanging gravity filter for emergency use that can be folded and stashed in a small survival kit until needed. 

Hanging Gravity Emergency Filtration

The Platypus Gravity Water Filter uses a hollow fiber filter cartridge with a tiny pore size of 0.2 microns, making it capable of removing all protozoa and bacteria (but not viruses). It’s suitable for using on any water source, including contaminated tap water supplies and natural water sources. The filtration speed depends on the amount of sediment in the water – it takes around 1 minute to filter 1 liter of water that’s relatively sediment-free. 

As a hanging gravity water filter, the Platypus system is a little different in design from the countertop systems we reviewed. Instead of having an upper and lower chamber connected by a filter, the Platypus Gravity Water Filter has two bags that are connected by a tube with an inline filter. You hang the “dirty” water bag up high, and gravity will send water down through the tube, through the filter, and into the “clean” water bag. If you want to avoid using two bags, the filter comes with a universal bottle adapter, so you can filter water straight into your chosen water bottle. 

Setup is a bit fiddlier than with a countertop gravity unit because there are a few very small components. Still, most people should be able to assemble and start using the system within 5 minutes in an emergency scenario. And when you don’t want to use the gear, there’s a storage bag that you can use to stash all the parts, so you’ll have everything you need in one place should an emergency situation arise. If you need to use the filter long-term, you can backwash it (just flip it the other way and flush water through it from the “clean” bag), and it should last up to 300 gallons with regular use. 

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Easy to Use

Our Rating: 4/5

★★★★★

How We Review

LifeStraw Personal Water Filter

The LifeStraw Personal Water Filter is our top recommended easy-to-use personal water filter for emergency use. This small, compact straw filter removes more than 99.99% of waterborne bacteria, including E. Coli, and can filter up to 5,000 liters of water (or around 1,320 gallons), making it one of the longest-lasting water purifiers available today.

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Specs

Type	$19.95
Filter Capacity	5,000 liters
Pathogen Removal	Parasites, Bacteria
Contaminants Removed	99% of all Biologicals
Certifications or Testing	EPA, NSF, ASTM
Process	Membrane Microfilter
Annual Cost	–
Warranty	3 years (limited)

The key reason why the LifeStraw is so popular is its simplicity of use: it’s a straw filter with a straightforward design that you can use to drink directly from any water source – no messing around with fiddly storage bags, tubes, or pumps. It requires sucking force to send water through the filter, so there’s some effort required in the filtration process. But because of its no-assembly design, we think it’s ideal for anyone whose priority is to quickly and easily access clean water in an emergency. 

Costing less than $20, the LifeStraw is an affordable investment, and one that’s justifiable for folks who simply want an emergency water filter that they can store in a survival kit with no intention of using (the filter has an unlimited shelf life). Our annual cost was $0 – the filter is intended to last over 5 years with single-person use, and from what we can tell, the whole device needs to be replaced at this time.  

Best For:

Folks looking for a personal water filter that they can use to drink straight from any water source with the reassurance that the filter will remove any nasties.

Simple, Convenient Straw Filtration 

The LifeStraw Personal Water Filter is lightweight and affordable, making it a suitable emergency water filtration solution for personal use. It’s super simple to use: you just dip the end of the straw in a water source and suck through the straw. This sends water up through the 0.2-micron hollow fiber filtration cartridge, which removes bacteria and protozoa, including Cryptosporidium and giardia (not viruses), before exiting the mouthpiece at the top of the straw. Water can be attained quickly, without the need for pumping or using chemicals. 

Of course, there are downsides to the simplistic design, too. Namely, there are no accessories for storing water, and there’s no way to filter water in advance and store it in your own bottle or container, either. The only way to get water through the filter is to suck through the straw, which inevitably means the water ends up in your mouth. That means you can only use it as an on-demand filtration solution and not to filter a stash of water, which you might be keen to do in an emergency situation. 

The 1,000-gallon lifespan is pretty good, but removing clogs or troubleshooting other issues is more difficult than it needs to be because everything is enclosed within the sealed tube. 

Related: Lifestraw vs Sawyer Mini: Which is Better?

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📚 Methodology: How We Tested The Best Emergency Water Filters

We wanted to be certain that our shortlisted emergency water filters were the best available across the board. We made the following considerations when ranking, reviewing, and testing the filters in this guide.

• Water purification method – We identified several effective water purification solutions for emergency situations, including boiling, chemical treatment, distillation, purification tablets, filtration in a portable water filter, and UV sterilization. In this guide, we wanted to focus on the best water filters for emergency use, since these have a few unique benefits over other methods: they’re typically quick and easy to use, they don’t require a heat source or electricity, and they’re very reliable.
• Filter type – Once we’d decided to focus on emergency water filters only, we wanted to make sure we were aware of every filter type that we could use for this purpose. In our research, we found gravity-fed water filters, inline filters (which can be used to drink directly from a water source or connected to bags, bottles, or hydration packs), water purification bottles (including straw filter bottles and push filter bottles), pump filters, and straw filters. We noted that these were all suitable for emergency use because they used filters that could remove microorganisms (and therefore could make any water source safe for drinking), and they didn’t need running water or electricity to operate.
• Source water – Next, we thought about the type of water that could possibly be available to us in emergencies, and what contaminants were the most important for us to remove. We knew that at the very least, an emergency water filtration solution needed to be able to reliably remove pathogens, including bacteria and cysts. Some of the most high-quality water filter systems we tested contained activated carbon filters and could also reduce chemicals, metals, viruses, and other common impurities that could be found in water after natural disasters or other emergencies. Our priority wasn’t to find a water filter that would make our water look, taste, and smell perfect – we focused instead on filters that reliably produced drinkable water.
• Filtration time – We knew that some folks would feel more reassured with an emergency water filter that would give them instant access to clean water, while others would be happy with a slightly longer wait time. We reviewed filters that filtered water instantly, like straw filters, press bottle filters, and squeeze filters, as well as gravity filters, which take slightly longer to filter water with a slower, steadier filtration process.
• Personal vs group use – Similarly, we identified some filters that were best suited for single-person use, while others were a better choice for groups. We found that an inline water filtration device is the best portable filtration solution for individual use, while hanging gravity bag filters and countertop gravity filters/dispensers were best for groups.
• Storage – Some of the emergency water purification systems we tested came with bags or containers for water storage, or allowed for easy dispensing into a storage container of your choice. Others, like straw filters and bottle filters, only allowed us to drink directly from the filter itself. It’s worth considering your storage preferences in an emergency water filter, especially if you factor in your daily water needs for things like washing, too. You might simply want to be able to access drinkable water during an emergency, or being able to store batches of water for multiple uses might be important. This will affect your buying decision.
• Weight and size – It’s hard to predict an emergency situation beforehand, we knew that different treatment systems would suit different situations in terms of size and weight. For folks who wanted a small, lightweight filter that they could stash in a survival kit, we tested and reviewed a range of portable water filters. For people who preferred having a larger system that they could use in a base location, we tested and shortlisted several countertop filters and larger pump filters.
• Filter longevity & maintenance – When it came to filter lifespan, some of the water filters we tested were more impressive than others. Most filters have a lifespan of around 10 years, which is pretty good, and some can last a lifetime with regular backflushing. Generally, you can judge whether a filter needs changing by its flow rate – if water is struggling to pass through the filter even with regular backwashing, it may be time for a new one. If you only plan to use a water filter during an emergency, filter lifespan is less important. As far as shelf life is concerned, most filters last decades, so you can keep your filter stored away in the knowledge that it’ll stiill be safe and effective to use in years to come.

🙋 Frequently Asked Questions

Do I need a water filter for emergencies?

Yes, we would argue that everyone needs a water filter for emergencies. The thing about emergencies is that you can never plan for them. That’s why it’s a good idea to have a survival water filtration device – because you simply never know when you might not have access to safe drinking water. Many people find it reassuring to know that they can purify water no matter what situation they may face.

Are emergency purification solutions easy to use?

Yes, all the best emergency water filters are easy to use, but some are easier to use than others. Straw filters and bottle filters are the easiest to use of all and require no setup, which makes them a good option for children. In any case, look for a high-quality water filter that comes with clear instructions for use.

How do I care for a survival water purifier?

If you’re just storing a survival water filter for emergency use, keep the filter stored in a dry, clean, cool location, then follow the setup instructions when (or if) you come to use it. Once you start using an emergency filter, you’ll need to follow the manufacturer’s instructions for care. This might include backwashing the filter regularly, preferably after every use, to clear accumulated sediment and maintain a good flow rate.

How long do survival water filters last?

Unopened and unused, most survival water filters last a lifetime. Once you use the filter, it might then last 1 year, 5 years, 10 years, or even longer, as long as you follow the manufacturer’s care instructions.

What’s the difference between a water filter and a water purifier?

But scientifically speaking, a water filter uses filtration media to greatly reduce the number of contaminants in water. Water filters are a popular option amongst survival preppers as they physically remove contaminants, but they don’t remove all microorganisms (most can’t remove viruses, for instance). A water purifier, on the other hand, purifies water by targeting microorganisms. Water purifiers don’t usually filter impurities from water. Instead, they’ll use a technique like UV purification or distillation to either separate water from its impurities or kill the impurities and prevent them from causing harm.

🤓 About Our Experts

This article was produced by Brian Campbell, WaterFilterGuru.com’s Founder, and Jennifer Byrd, our water treatment specialist. To learn more about who they are and what they do, check out their author bios below.