Pleatco PRB75-M Dynamic Series V-DSC-75, Series II and III RTL/RCF-75, Custom Molded Products (MICROBAN), 1 Cartridge Replacement cartridge filter for pool and spa cleaning systems 50 Percent open ABS free flow cores maximize water flow through reemay filter media Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span Replaces unicel C-4975 and filbur FC-2395M ; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 5-inches in diameter 20-1/8-inches in length and 2-1/8-inches of top and bottom hole diameters