Pleatco PA137-M Replacement Cartridge for Hayward Super-Star-Clear C-5500 SwimClear C-5520 (MICROBAN), 1 Cartridge Replacement cartridge for Hayward super-star-clear c-5500, swimclear c-5520 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-7490 and filbur FC-1297; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algae Measures 7-inches in diameter by 32-3/4-inches in length and 3-inches of top and bottom hole diameters