Culligan US-3UF-R Under-Sink Drinking Water Filter Replacement Cartridge, 2 Count (Pack of 1), White The Culligan US-3UF-R filter cartridge should be replaced every 6 months to keep the system working efficiently and to keep your family safe from harmful contaminants. The Culligan US-3 Ultra Filtration Undersink Drinking Water System reduces: bacteria, viruses, reduces chlorine, taste odor, lead, lindane, atrazine, and microbial cysts. This premium filtration system does not produce waste water like competitive reverse osmosis systems that are out on the market today. This Culligan water filtration system is set apart by including a filter life indicator, leak sensor with alarm, chrome faucet, quick connect fittings, 3-in-1 filter cartridge for easy replacement. Easy-change filters make changing filters a snap, eliminates the need to turn off your water supply. Features The right part for your system ? Designed and built specifically for the Culligan US-3UF Ultra Filtration Under Sink Drinking Water System. Convenient easy-change filter design ? Change your filter quickly and tool-free without having to turn off your water supply. Secure and leak-free ? 3-in-1 cassette style filter provides filter replacement with a locking handle. Get pure water ? Reduces bacteria, viruses, chlorine, lead, lindane, atrazine, and microbial cysts, resulting in much cleaner water for you and your family. Extra long filter life ? Get clean, fresh-tasting water with fewer filter changes. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.