A filter you can trust: This filter we put our name to is fully certified by the NSF, against NSF standards 401, 53 and 42. This ensures this filter is tested to reduce chlorine, bad taste and odor, cyst, phenytoin, ibuprofen, naproxen, nonyl phenol, etc. For a filter you can trust, our product is also NSF 372 certified for lead-free material. Simply replace your filter every 6 months, or after 300 gallons, and enjoy the clean water you and your family deserve. | A team that cares: From our base here in Los Angeles, CA, we believe in the importance of shared values and sustainable development for the benefit of everyone. We know that it’s our responsibility to create value for everyone involved with our products, as well as the world around us. That’s why when you buy a Waterdrop filter, we promise to donate one day of clean drinking water to children in areas that need it now more than ever. We feel it’s the least we can do. | 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.