Pleatco PWW150-M4 Replacement Cartridge for Upgrade to Waterway Pool 150, Leisure Bay WW-150, 1 Cartridge Replacement cartridge for upgrade to waterway pool 150, leisure bay ww-150 models 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-9403 and filbur FC-2969; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 10-inches in diameter by 25-1/4-inches in length and 6-inches of top and bottom hole diameters