Pleatco PWW50P3-M Replacement Cartridge for Waterway Front Access Skimmer, Aber Hot Tubs, (MICROBAN), 1 Cartridge Replacement cartridge for waterway front access skimmer, aber hot tubs 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 CH-940 and filbur FC-0359; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 6-inches in diameter by 7-5/8-inches in length and 1-1/2-inches of bottom hole diameter