FilterVerdict

Genuine vs certified third-party refrigerator water filters, checked against the certification listings.

What this is

One page per refrigerator water filter cartridge. Each page checks the genuine cartridge against its certification listing and states a real drawback. Most pages do not yet check a specific third-party cartridge — where one has been checked, the page says so and names it; where none has, the page shows you the exact check to run on any cartridge you are holding, in the certifier's own listing.

We do not test filters in a lab. We check the claims that can actually be checked: the certification listing, the manufacturer's own specifications, and a price with a date on it.

How verdicts work

• Certification first. A cartridge is "certified" here only if a certifier's public listing (NSF International, IAPMO, WQA) names that cartridge or its system — or, where the only support is the manufacturer's own document, the page says exactly that and labels the link as the manufacturer's statement or a reproduction, never as a listing. "Tested to NSF standards" is not the same sentence as "certified," and pages here say which one applies.
• Every page carries a real drawback. Cost, a chipped-key lock-in, a slow flow rate, a small capacity — if a page has no negative, it does not publish.
• Bottom line first. Every cartridge page opens its verdict with one plain sentence you can act on, then shows the evidence under it.
• Prices are dated, or not shown. A price appears only with the date it was checked and the retailer it came from. Otherwise the page says the price is not listed.
• Sources on every page. Every specification traces to a source linked on the page itself.

Browse 4 cartridge pages by brand family →

New pages are added one at a time, each checked the same way. See how to check a cartridge in the NSF listing yourself.