Pentek CW-MF # 155187 CWMF Sediment Replacement Water Filter Cartridge Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Polypropylene String Wound Sediment Water Filter, Medium Fine, 30 micron. 9 7/8" long X 2 1/2" diameter. 24 per case, sold individually. Ametek # 155187 CW Series cartridges are manufactured from a durable polypropylene core that is wound around a rigid polypropylene core. They are an economical solution to reduce fine sediment, including sand, silt, rust and scale particles. Great prefilter, pre filter, pre-filter. Order a case of 24 and save even more.