Pentek CW-F # 155186 CWF 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, Fine. 10 Micron nominal. 9 7/8" long X 2 1/2" diameter. 24 per case, sold individually. Ametek # 155186 CW Series cartridges are manufactured from a durable polypropylene cored 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.