At the very least, even the most basic refrigerator water filter can remove chlorine, taste, and odor, supplying fresh-tasting water from your fridge.
The most common certification that a refrigerator filter manufacturer can obtain is NSF Standard 42.
A refrigerator filter also can’t remove bacteria, hardness minerals, and very small contaminants like microplastics, which could simply slip through the filter’s pores.
Filter Media First, the type(s) of filter media used inside a refrigerator water filter determines the thoroughness and complexity of its contaminant removal.
Filters with a large surface area can remove more contaminants from water flowing through because there’s greater opportunity to trap these contaminants in the filter media.
Over time, the filter media becomes degraded and clogged, and small holes may form, allowing unfiltered water to pass through.