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This replacement cartridge uses multi-stage filtration to help reduce chlorine, chloramines, taste and odor, sediment, rust, and select heavy metals (including lead), while the food-grade housing is designed to be BPA-free and resist cracking or leaks. It installs easily in EZ-Change style under-sink systems for filtered drinking water and ice, with a suggested replacement interval of up to 12 months or 2,000 gallons (whichever comes first; actual life varies by local water quality). It is a replacement for Culligan RC-EZ-1/RC-EZ-3/RC-EZ-4 and compatible with Culligan IC-EZ/US-EZ/RV-EZ systems, and it is also a replacement for Brita USF-201/USF-202/USF-203 and DuPont WFQTC30001/WFQTC70001/WFQTC90001. 【High-Efficiency Filtration】Designed to help reduce chlorine, chloramines, lead and other heavy metals, as well as taste & odor, sediment, and rust—supporting a cleaner, better-tasting water experience. 【Safe Materials】Made with food-grade housing that helps prevent impurities from leaching back into the water, and built for reliable everyday use. 【Easy Installation】Quick, tool-free installation with a secure seal; works well in an under-sink EZ-Change setup for filtered water and ice. 【Easy Installation】Quick, tool-free installation with a secure seal; works well in an under-sink EZ-Change setup for filtered water and ice. 【Long Service Life】For continued performance, replace every 12 months or 2,000 gallons (whichever comes first); actual lifespan may vary with local water quality. Brand Aqua Crest Rec. use Residential Model W-AQU-RC-EZ-4-1N Has written warranty No