The best gravity water filters are portable, easy to set up and use in any location, and capable of reducing dozens of contaminants without the need for water pressure or electricity.
We test and compare water filters using our own hands-on comprehensive assessment process, covering all areas of performance.
I’m a WQA Certified Water Specialist (CWS) and Certified Water Treatment Representative (CWR), and I’ve used my experience and knowledge to personally test and review each product on this list.
Waterdrop King Tank
Epic Pure Dispenser
Alexapure Pro
Table of Contents
Our Testing & Selection Process
How We Test & Score
The filters in our “best” listicles are ranked based on the results they obtain in our water filter scoring system. We award overall scores to water filters based on a weighted average of 6 key scoring factors, comprising 9 sub-factors.
For our Best Gravity Water Filter guide, we selected the highest-scoring filters that qualify as gravity-fed filters, meaning that they filter water without water pressure or an electric pump.
The main performance tests that we carry out for each filter are for contaminant reduction, design, filtration rate, setup, maintenance, and company. Filters are more likely to be featured and shortlisted if their collective scores – and their contaminant reduction scores in particular – are high. 
There were a few other factors we evaluated when testing and selecting the filters in this guide, including their filtration media, water-holding capacities, and whether or not they could also be used to filter untreated water.
We aim to review water filters as fairly and objectively as possible, but some of our data is subjective – such as what we personally think about a system’s ease of setup or design quality.
We chose the winners for this review based on their overall performance capabilities.
There are a whole host of factors that we consider when choosing the best products to recommend, and the order that they should feature.
We know our readers have different preferences when it comes to setup, design, and costs, so we aim to keep our recommendations as varied as possible, with different filters that appeal to different situations.
Many water filters that we’ve reviewed didn’t make the cut. For instance, those that use electricity or need to be plumbed in didn’t fit the description of gravity filters, so they were excluded from this list. We also discounted systems that weren’t available in the USA, were sold by lesser-known manufacturers, or simply performed more poorly than their competitors.
Good to Know: We test new water filters every week, and we occasionally swap out products in our guides when we come across better-performing systems that we want to recommend.
The 6 Best Gravity Water Filters
| Product | Waterdrop King Tank | Epic Pure | Alexapure Pro |  Clearly Filtered |  ZeroWater Dispenser | ProOne Big+ |
|---|---|---|---|---|---|---|
| Score | 9.10 | 9.05 | 8.93 | 8.78 | 8.74 | 8.56 |
| Price | $249.00 | $75.00 | $259.95+ | $90.00 | $74.99 | 229.95+ |
| Certifications | NSF 372 for lead-free design | Not certified | Not Certified | NSF/ANSI 42 & 53 | NSF/ANSI 42 & 53 | NSF 42 (materials safety only) |
| Filter Capacity | 6,000 gallons | 150 gallons | 200 gallons/cartridge | 100 gallons | 25 gallons | 1,000 – 1,200 gallons |
| Cost per Gallon | $0.06 | $0.31 | $0.59 | $0.55 | $0.70 | $0.41 |
| Warranty | 1 year | Lifetime | 1 year | 1 year | Vessels 90 days, filters 30 days | 1 year |
| Read Review | Waterdrop King Tank review | Alexapure Pro review | Clearly Filtered review | ProOne Big+ review |
Waterdrop King Tank
The Waterdrop King Tank got the highest overall score in our testing, and it outperformed similar systems across many performance categories. The stainless steel unit did a better job at reducing contaminants than any other system, and impressed us the most with its design quality.
Best For
Product Specs
| Price | $249.00 |
| Contaminants Reduced | 200+ |
| Certifications | NSF 372 for lead-free design |
| Process | Carbon + Ion Exchange |
| Filter Capacity | 6,000 gallons |
| Annual Cost | ~$60 |
| Warranty | 1 year |
Why It’s Our Favorite
The Waterdrop King Tank is our top recommended gravity water filtration system because it got the highest overall score of all gravity-fed filters we tested: 9.10.
In our testing, the system reduced contaminants more thoroughly than any other gravity filter, had one of the fastest flow rates, and was more affordable to maintain than all of the other shortlisted filters.
Plus, the system has a stainless steel design and comes with a steel/glass sight spigot, so we preferred its design quality to many of the plastic gravity systems we used.
Waterdrop King Tank Performance
The Waterdrop King Tank received the top score of all the filters on this list for contaminant reduction: 9.51.
We tested the system with a water supply that contained lead, aluminum, chloroform, total THMs, chlorine, and manganese, and we were pleased to see that it eliminated 100% of these impurities, along with 93% copper, 40% barium, and 28% sulfate. It comes with separate fluoride filters, which reduced 100% fluoride. Our only disappointment was that, as with many stainless steel countertop systems, the King Tank isn’t performance-certified.
The unit got the top score for filtration rate: 10.00. It filtered water faster than all of the other systems we tested for this guide, with a filtration rate of 4 GPH (gallons per hour).
We awarded the system a 9.40 for design. It was the only gravity water filter we shortlisted that has been certified to NSF 372, for lead-free design, it’s a stainless steel system that comes with a stainless steel/glass spigot as a given (rather than an add-on at an extra cost, as we found with other systems), so the quality was generally high. That said, we did note that it seemed thinner and a bit flimsier compared to other similar systems.
Our only gripe with the Waterdrop King Tank was its unnecessarily difficult setup process. Assembling the unit was fine, but we had to prime the filters manually, and this was tricky and time-consuming. We awarded the system a lower 6.50 score here. Its maintenance score was also influenced because we had to prime our replacement filters too. Its ongoing cost was super affordable, though, at just $0.06.
We think the Waterdrop King Tank is the best gravity-fed water filter for folks who want to reduce as many contaminants as possible with a system that filters water quickly and is super affordable to maintain in the long run.
| Criteria | Results |
|---|---|
| Overall Score | 9.10 |
| Health Related Contaminants | 9.90 |
| Aesthetic Related Contaminants | 9.90 |
| Performance Certification | Not certified for any reduction claims |
| Filtration Rate | 4 GPH |
| Component Quality | Excellent |
| Component Certification | Certified |
| Setup | Failing |
| Servicing Requirements | Weak |
| Costs | $0.06/gallon |
| Warranty Length | 1 year |
| Shipping | Free shipping to lower 48 |
| Returns | 30 days |
Epic Pure Water Filter Dispenser
The Epic Pure Water Filter Dispenser is the best-performing gravity-fed water filter dispenser that we’ve tested so far. It got the second-highest overall performance score, despite being significantly more affordable and easier to set up than the Waterdrop King Tank.
Best For
Product Specs
| Price | $75.00 |
| Contaminants Reduced | 200+ |
| Certifications | Not certified |
| Process | Solid Activated Carbon Block |
| Filter Capacity | 150 gallons |
| Annual Cost | ~$150 |
| Warranty | Lifetime |
What We Thought
The Epic Pure Dispenser is the most affordable gravity-fed water filter on this list, and it did a better job at reducing contaminants than many systems costing up to five times its upfront price.
It also has the least complex design of all the gravity filters we tested, with just three main components (the dispenser, the upper reservoir, and the filter), so it’s great for folks who want a lightweight system that’s super easy to assemble.
In our testing, the Epic dispenser reduced all impurities to below the lab’s Health Guideline Levels, and its 2.23 GPH filtration rate is great, especially given that it uses just one filter that’s smaller than the filters in the stainless steel systems.
Epic Pure Performance
The Epic Pure Dispenser’s overall contaminant reduction score was 9.00 – one of the highest scores of all the gravity filters we tested. We used it to filter our water containing chlorine, uranium, copper, phosphorous, molybdenum barium, fluoride, nitrate, and sulfate.
It eliminated the first four contaminants, and reduced 57% molybdenum, 41% barium, 27% fluoride, and 20% nitrate, and 92% sulfate.
Again, the Pure dispenser isn’t performance-certified, so it did no better than Waterdrop in this category.
We had a great experience with the setup process for the dispenser; much better than with many of the other systems we tested for this guide. We gave it a 9.50 score because we only had to wash and assemble the pitcher and reservoir, then insert the filter. The filter didn’t need to be primed – we just filtered and discarded the first batch of water.
This Epic system also had a fast filtration rate of 2.23 GPH, and its simple servicing requirements and low ongoing spend of $0.31/ gal also gave it a great score of 9.50 for maintenance.
The only area of improvement was design. The Pure dispenser isn’t certified for materials safety, and it got a lower design quality score from us because it’s made from plastic, which felt quite thin and flimsy.
We think the Epic Pure dispenser is the best gravity-fed filtration system for people with smaller budgets who want a capable system that’s easier to install than many stainless steel alternatives.
| Criteria | Results |
|---|---|
| Overall Score | 9.05 |
| Health Related Contaminants | 9.30 |
| Aesthetic Related Contaminants | 9.90 |
| Performance Certification | Not certified for any reduction claims |
| Filtration Rate | 2.23 GPH |
| Component Quality | Good |
| Component Certification | Not certified |
| Setup | Outstanding |
| Servicing Requirements | Outstanding |
| Costs | $0.31/gallon |
| Warranty Length | Lifetime |
| Shipping | Free shipping for the Clean Water Club only |
| Returns | Lifetime |
Alexapure Pro
The Alexapure Pro is another stainless steel countertop gravity-fed filter that didn’t quite match up to the Waterdrop King Tank dispenser in terms of contaminant reduction or filtration rate, but had a better design quality and was much easier to set up and maintain. It also has a unique benefit over the King Tank: it can be used to filter untreated water thanks to its microbiological contaminant reduction ability.
Best For
Product Specs
| Price | $259.95+ |
| Contaminants Reduced | 200+ |
| Certifications | Not Certified |
| Process | Ceramic + Carbon |
| Filter Capacity | 200 gallons/cartridge |
| Annual Cost | ~$120 |
| Warranty | Lifetime + 30-day return |
Why It Made This List
The Alexapure Pro took the third spot on our list because we were impressed with its ability to reduce contaminants in our treated and untreated test waters.
We also appreciated the fact that the unit uses just a single main filter that’s designed to target all contaminants, including fluoride (although we had a different experience in our testing – see below). Plus, its filters are shipped pre-primed, which saved us a big job when we were setting it up.
Alexapure Pro Performance
The Alexapure Pro got the second-highest score for contaminant reduction: 9.34. We tested the system using two water sources: one was the same water that we filtered in the Waterdrop King Tank, and the other was untreated river water.
In our river water test, the Alexapure Pro eliminated all bacteria and greatly reduced aluminum. This is one of the unique benefits of this filter – it’s one of the few gravity-fed filters that can filter unpotable water, too.
In our treated water test, the Alexapure Pro performed the same as the King Tank in reducing 100% lead, chloroform, total THMs, chlorine, and manganese. It also did slightly better at reducing 100% copper and aluminum, as well as 43% barium, but only 16% sulfate.
However, what let the Alexapure Pro down in this category was that the concentrations of fluoride, magnesium, calcium, and strontium actually increased in our filtered water, and potassium and silver appeared when they weren’t present before.
We think this was due to leaching from the initial 100 gallons of a different water source that we sent through the filters before conducting our test, but our results still showed that the Alexapure Pro didn’t effectively reduce fluoride. This was disappointing because we’d anticipated that the system should reduce >97% fluoride (according to Alexapure’s test results) without a separate filter, which would have given it the edge over the Waterdrop system.
Additionally, the Alexapure Pro doesn’t have any performance certifications, so although its contaminant reduction was overall very good, there’s still room for improvement.
However, there were a few things that we loved about the Alexapure Pro, and design quality was one of them. It secured the highest 10.00 score here because it’s made from high-quality stainless steel parts, including the spigot. It also did well in the setup and maintenance categories, securing high scores of 9.00 and 8.25 respectively. We didn’t have the hassle of priming the filters, so it was quicker and easier to set up and maintain than the Waterdrop King Tank.
The Alexapure Pro’s maintenance score could have been higher – its ongoing cost of $0.59/ gallon made it more expensive than its top competitors.
We think the Alexapure Pro is a great choice for folks who want a gravity-fed filter that effectively reduces a whole host of contaminants (but not necessarily fluoride) and has the easiest setup and maintenance and the highest-quality design.
| Criteria | Results |
|---|---|
| Overall Score | 8.93 |
| Health Related Contaminants | 9.70 |
| Aesthetic Related Contaminants | 9.90 |
| Performance Certification | Not certified for any reduction claims |
| Filtration Rate | 1 GPH |
| Component Quality | Exceptional |
| Component Certification | Not Certified |
| Setup | Excellent |
| Servicing Requirements | Good |
| Costs | $0.59/gallon |
| Warranty Length | 1 year |
| Shipping | Free shipping to lower 48 |
| Returns | 30 days |
Clearly Filtered Water Pitcher
The Clearly Filtered Water Pitcher has a smaller water-holding capacity than the other gravity filters on this list, so it’s the best choice for folks looking for a portable water filtration solution. It also has a few benefits over many of the other systems we reviewed: it has a WQA performance certification, and it’s more affordable upfront than the larger stainless steel systems.
Best For
Product Specs
| Price | $90.00 |
| Contaminants Reduced | 365+ |
| Certifications | NSF/ANSI 42 & 53 |
| Process | Coconut Carbon Block |
| Filter Capacity | 100 gallons |
| Annual Cost | ~$150 |
| Warranty | 1 year |
Our Verdict
We shortlisted the Clearly Filtered Water Pitcher for this listicle because it removed more contaminants more thoroughly than most of the other water filter pitchers we tested. It also impressed us with its 100-gallon filter capacity, which is better than most other pitcher/dispenser filters (although Epic still did better with its 150-gallon capacity).
Plus, assembly and maintenance were both super easy – we used the included priming tool, which made the process simple – and the system costs less than $100 upfront, so it’s the makes-sense solution for smaller budgets.
Clearly Filtered Performance
The Clearly Filtered Pitcher got a score of 8.24 for contaminant reduction. Its score would have been higher, likely securing it in a top-three position, if it wasn’t for one disappointing outcome of our testing: 0.0054 PPM of cobalt was detected in our water after filtration, which we assume leached from the filters (we plan to repeat testing in the future to see if this issue occurs again).
That aside, the Clearly Filtered pitcher did an excellent job of eliminating 100% fluoride, uranium, chlorine, and copper, as well as 86% barium, 67% strontium, 53% molybdenum, and low levels of nitrate and sulfate, from our test water. It also has a performance benefit that no other system on this list has so far: a WQA certification to NSF/ANSI Standard 42, for the reduction of chlorine, and Standard 53, for the reduction of PFOA/PFOS.
The pitcher’s filtration rate measured at 2.27 GPH, making it slightly faster than Epic’s (2.23 GPH), and it got the highest score of 10.00 in this category.
We’ve tested numerous plastic pitchers that feel thin and flimsy, but the Clearly Filtered pitcher got a high 9.70 score in the design category. It’s made from BPA-free Tritan plastic, which might not be comparable to stainless steel, but we noted that it felt thicker, sturdier, and more durable than most other pitchers we tested. It also has a materials safety certification and a WQA certification for lead-free design.
The CF pitcher actually costs around $15 more than the Epic Pure dispenser upfront, and it has the highest cost of any gravity filter on this list ($0.55/ gallon), but we think its certifications and better design quality make it worth this extra cost.
The Clearly Filtered pitcher is the best gravity-fed water filter for folks who value certifications and want a more portable system that offers a superior filtration performance.
| Criteria | Results |
|---|---|
| Overall Score | 8.78 |
| Health Related Contaminants | 8.30 |
| Aesthetic Related Contaminants | 9.90 |
| Performance Certification | Certified for 0.82% of reduction claims |
| Filtration Rate | 2.27 GPH |
| Component Quality | Outstanding |
| Component Certification | Certified |
| Setup | Outstanding |
| Servicing Requirements | Outstanding |
| Costs | $0.55/gallon |
| Warranty Length | 2 years |
| Shipping | Free shipping |
| Returns | 30 days |
ZeroWater 40-Cup Dispenser
The ZeroWater 40-Cup Glass Dispenser is a glass gravity-fed water filtration system that performed very similarly to Clearly Filtered in the contaminant reduction, filtration rate, and setup and maintenance categories. Like the CF pitcher, it’s also performance-certified, and it has one advantage over the other gravity-fed filters in this list: it’s made from glass, so it doesn’t have the potential rusting issues of steel or the possible microplastics leaching from plastic.
Best For
Product Specs
| Price | $74.99 |
| Contaminants Reduced | 24 |
| Certifications | NSF/ANSI 42 & 53 |
| Process | Activated Carbon + Ion Exchange Resin |
| Filter Capacity | 25 gallons |
| Annual Cost | ~$110 |
| Warranty | Vessels 90 days, filters 30 days |
Why We Like It
One of our main reasons for shortlisting the ZeroWater Glass Dispenser in this guide is that it’s made of glass. This gives it a sleeker, more expensive look than plastic dispensers like the Epic Pure unit, but, unlike stainless steel systems, we were still able to view the water inside.
We also awarded this ZeroWater system high scores for contaminant reduction, filtration rate, design, and setup.
Another bonus of the ZeroWater filter is that it’s certified to reduce 6 contaminants – that’s three more than Clearly Filtered – as well as having a materials safety certification.
ZeroWater Performance
The ZeroWater Glass Dispenser secured an 8.34 score – the same as Clearly Filtered – for contaminant reduction. Its overall performance in our testing was exceptional, with our results showing that it reduced 100% fluoride, chlorine, uranium, barium, strontium, molybdenum, nitrate, and sulfate, as well as 97% copper.
However, as with Clearly Filtered, there was one outcome of our ZeroWater test that pulled down its contaminant reduction score: 3.4 PPB of chloroform was detected in our filtered water. That meant this harmful disinfection byproduct hadn’t been effectively reduced by the filter and was present at levels exceeding the lab’s Health Guideline Level of 0.2 PPB.
On a better note, the dispenser has NSF Standard 42 and Standard 53 certifications for reducing chlorine taste and odors, mercury, lead, PFOA, PFOS, and hexavalent chromium, giving it an advantage over many other gravity-fed filters, especially the stainless steel units.
We were also impressed with ZeroWater’s filtration speed of 2.62 GPH, making it slightly faster than most other gravity-fed systems we shortlisted, although not as fast as Alexapure.
We also awarded the dispenser a high setup score (9.50), and it was the easiest to assemble of all the systems we tested, requiring no filter flushing, priming, or soaking.
There’s a TDS meter included with the dispenser, which we found helpful in checking the filter’s performance and lifespan. We were instructed in the user manual to replace the filter when the TDS meter reading was 006, so we didn’t have to guess with this aspect of maintenance as we did with other systems.
But we were disappointed with the filter’s 40-gallon capacity, which meant it needed replacing far more frequently than any other gravity filter we tested. This brought its ongoing cost up to $0.70/ gallon: over 10 times Alexapure’s cost per gallon.
We think the ZeroWater Glass Dispenser is the best performance-certified gravity-fed water filter for folks who want to limit their water’s contact with plastic and prefer the look of a glass dispenser over stainless steel.
| Criteria | Results |
|---|---|
| Overall Score | 8.74 |
| Health Related Contaminants | 8.30 |
| Aesthetic Related Contaminants | 9.90 |
| Performance Certification | Certified for 25% of reduction claims |
| Filtration Rate | 2.62 GPH |
| Component Quality | Exceptional |
| Component Certification | Certified |
| Setup | Outstanding |
| Servicing Requirements | Outstanding |
| Costs | $0.70/gallon |
| Warranty Length | Vessels 90 days, filters 30 days |
| Shipping | Free on orders over $60 to continental US |
| Returns | No returns |
ProOne Big+
The ProOne Big+ is another stainless gravity-fed water filter, like the Alexapure Pro and the Waterdrop King Tank. The system was slightly behind its competitors in the contaminant reduction category, but it had the highest design score because it’s the only stainless steel system we tested with a top-quality design and a materials safety certification (for the filter only). It’s also at least $50 more affordable than its competitors.
Best For
Product Specs
| Price | 229.95+ |
| Contaminants Reduced | 200+ |
| Certifications | NSF 42 (materials safety only) |
| Process | Ceramic + Carbon |
| Filter Capacity | 1,000 – 1,200 gallons |
| Annual Cost | ~$100 |
| Warranty | 1 year |
Our Take
The ProOne Big+ is one of the only other gravity filters (along with the Alexapure Pro) that can be used to filter untreated water. That means it’s another of our recommendations on this list that’s suitable for filtering water off-the-grid or in emergency situations. It also got the highest overall design score of all the stainless steel units, and did better than Waterdrop and Alexapure in the maintenance category.
Like the Alexapure Pro, the Big+ doesn’t require a separate fluoride filter – its main filter element can reduce this contaminant. The difference here is that the filter actually did reduce 100% fluoride in our water (the same couldn’t be said for Alexapure).
ProOne Big+ Performance
The ProOne Big+ secured a score of 8.44 for contaminant reduction – that’s slightly higher than Clearly Filtered and ZeroWater, but not as high as Epic or the other stainless steel systems.
It eliminated 100% lead, copper, fluoride, aluminum, and manganese in our testing, but its score was affected by its inability to effectively address disinfection byproducts: it reduced just 47% of total THMs and 56% chloroform.
In our untreated river water test, we were pleased with our Big+ results, which showed that the filter had eliminated all three bacteria types detected in our unfiltered water.
But there was no difference in the performance certification category: like the other stainless steel gravity filters, the Big+ isn’t certified.
This ProOne unit combined the best design features of the other two stainless steel systems: the same high-quality, durable steel design as the Alexapure Pro, and a design certification like the Waterdrop King Tank (in this case, a materials safety certification for the filter elements themselves), awarding it the highest 10.00 score in this category.
We had an easier time setting up the system than we did with Waterdrop, although not quite as easy as Alexapure. The filters didn’t need priming, but we still had to scrub them under cold water with a scouring pad. The lack of filter priming also meant the Big+ secured a good maintenance score of 8.75, although it has a higher ongoing servicing cost of $0.41/ gallon.
The ProOne Big+ is the gravity-fed filter we recommend to folks who want the most affordable stainless steel system with a high-quality design, easy setup and maintenance, and suitability for emergency preparedness situations.
| Criteria | Results |
|---|---|
| Overall Score | 8.56 |
| Health Related Contaminants | 8.65 |
| Aesthetic Related Contaminants | 9.90 |
| Performance Certification | Not certified for any reduction claims |
| Filtration Rate | 0.77 GPH |
| Component Quality | Exceptional |
| Component Certification | Exceptional |
| Setup | Good |
| Servicing Requirements | Good |
| Costs | $0.41/gallon |
| Warranty Length | 5 years |
| Shipping | Free shipping on orders over $69.95 to the lower 48 states |
| Returns | 30 days |