Pentek PCF1-20MB # 155274 PCF1 20MB DI Deionization Replacement Water Filter Cartridge Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands Deionization Water Filter. FDA D.I. Resin. 20" long X 2 7/8" diameter. 6 per case, sold individually. Ametek # 155274 PCF Series cartridges have been developed in response to the requirements for deionized water in many industries. They are manufactured using an FDA compliant resin that has been subjected to additional post-production steps to minimize the total organic carbon (TOC) level. This high capacity, semi-conductor grade resin cartridges are ideal for use in pharmaceutical and medical laboratories, cosmetics and circuit board printing applications requiring zero TDS water (total dissolved solids). Order a case and save even more.