Waterdrop filters are comprehensively certified by the NSF, WQA, and IAPMO against NSF standards 401, 53, 42 & 372 test from each component to the filter cartridge as a whole to achieve a supreme filtration performance. This refrigerator replacement filter has been strictly tested by NSF 401 to remove phenytoin, ibuprofen, naproxen, estrone, bisphenol A and nonylphenol. Asides it has also been certified against NSF 53 standards to remove Cyst in water. | [Intense filtration] Waterdrop refrigerator filters remove a wide range of harmful substances in water including chlorine, heavy metals, odor, THM, VOCs, particles, cadmium, chromium, copper, and any other major impurities tested by independent laboratory to remove these substances. The filter also works to retain many of the beneficial minerals that are essential in keeping our bodies running properly. | [Exceptional fit] Waterdrop combines precision measurement technology with advanced industrial automation equipment to perfectly reproduce the original scale parameters. We strive to provide perfectly fitting refrigerator filters with impeccable engineering designs, unlike inferior replacement filters that often cause water leakage issues. Waterdrop spends time working to save you the time and hassle by offering tool-free, mess-free refrigerator filter replacements. | [Premium filter material] Instead of using charcoal containing coal, wood, walnut shell, and apricot shell, Waterdrop adopts 100% selected coconut shell carbon block from Sri Lanka that contains a surface area that is twice as large, with more micropores than inferior carbon block. This allows the filter cartridge to efficiently remove chlorine, turbidity, bad taste and odor, rust, sediment, and a wide range of heavy metals. | [Fresh taste] The 100% natural coconut shell carbon block absorbs more impurities than low-priced and mixed carbon block. Waterdrop’s refrigerator filter significantly improves the taste of drinking water to provide the best water filtration experience possible. | [Replacement reminder stickers] Expired replacement filters might cause an accumulation of pollutants and a lower level of filtration performance. Therefore, Waterdrop includes a complimentary set of monthly install stickers to remind you of your filter’s lifespan. The filter life is 6 months or 300 gallons (varies based on the water condition). | [Responsibility] Each product, even small components manufactured by Waterdrop, must pass extremely high examination standards to reach the top requirement on the market. This does not end when a product leaves our factory: Our 24/7 customer service team will provide water purification solutions and help you answer your questions at any time. | [Water is life, treat it right] We believe everyone has the right to consume pure water, no matter where they are. We are not only about our business; we prioritize using our technology to help people. A portion of every purchase made is donated to deliver clean, pure water to children in water-scarce regions in Africa. | Replacement models: OnePurify RFC1400A , Tier1 RWF1022, Aqua Fresh WF286, Clear Choice CLCH111, WaterSentinel WSW-4,EDR8D1, 2206039, 9002, 2204324, 2206048, 2213384, 2204326, 8171788, 8171787, 8171414, 8171413T, 8171413R, 8171413P. Waterdrop is an independent brand.