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Immediately after easy installation, the Culligan RFC-BBS-D whole house water filter replacement cartridge will go to work, significantly reducing potentially harmful impurities from your drinking water, including chlorine, sediment, rust and dirt. A genuine OEM part from the manufacturer, this filter is designed to fit into whole house water filtration systems that use 9-3/4 in. x 4-1/2 in. cartridges.