Pleatco PWW50L-M Replacement Cartridge for Waterway Teleweir 50-Square-Foot Filter (ANTIMICROBIAL), 1 Cartridge Replacement cartridge for waterway teleweir 50-square-foot filter 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 4CH-949 and filbur FC-0172; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 5-inches in diameter by 13-1/16-inches in length and 1-1/2-inches of bottom hole diameter