Waterdrop filters are comprehensively certified by the NSF against standards 401, 53, 42 & 372 test from each component to the filter cartridge as a whole to achieve a supreme filtration performance. | [Intense filtration] Waterdrop refrigerator filters reduce a wide range of harmful substances in water including chlorine, heavy metals, lead, mercury, odor, THM, VOCs, particles, cadmium, chromium, copper, and any other major impurities tested by independent laboratory to reduce 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. | [Compatible models] Bosch 640565, AP3961137, 1257074, 56932, 2168701, 70020002518, W1085590, EVOLFLTR10 , B20CS5. CS-52, CS-51, CS-450 , CS-451, CS-452, CS-512, CS-522, CS-532, CS-562, OCS CS-52, CS-51, 5553629, 55866-05, 5586605, 55866-06, 5586606. WHKFR-PLUS, WHKF-R-PLUS, WHCF-IMTOS, WHCF-IMPLUS, WHKFR Plus WHCF-R-Plus 56932, W1085590, 8668597, C00094379, C00097913, D846181. Also compatible with WSB-1, WSQ-1, Wf297, RWF1100, RFC1800A, RWF2700A, GS-BQ1, EP-CS52, SGF-BO52, WF-640565. | [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.