OMNIFilter RS14-DS3-S06 Standard Cartridge, White Polypropylene spun replacement cartridge, manufactured from 100% pure polypropylene Designed for medium sediment filtration for the whole house Reduces sediment, sand, dirt and rust particles Can be used on chlorinated or non-chlorinated water Fits OMNI Filter OB1, OB5, U25, U30 whole house filter housings and other major brands like 3M, American Plumber, Aqua Pure, Culligan, Cuno, DuPont, GE, Pentek, Watts, Whirlpool and others