Pleatco PWW100-M4 Replacement Cartridge for Waterway Pool 100, Leisure Bay WW-100 (MICROBAN), 1 Cartridge Replacement cartridge for waterway pool 100 and leisure bay ww-100 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-9402 and filbur FC-2965; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 10-inches in diameter by 19-1/4-inches in length and 6-inches of top and bottom hole diameters