OMNIFilter Omni Filter RS18-SS2-S06 Heavy-Duty Cartridge Heavy-duty replacement polypropylene spun cartridge, made with 100% pure polypropylene Designed for general sediment filtration for the whole house Reduces sediment, sand, dirt and rust particles to 50 microns Can be used on chlorinated or non-chlorinated water Fits OMNI Filter BF6, BF7, BF9C, BF35, BF36, BF36C filter housings along with other major brands like 3M, American Plumber, Aqua Pure, Culligan, Cuno, GE, Pentek, Watts, Whirlpool and others