Pleatco PA112-M Replacement Cartridge for Super Star Clear C-4500 SwimClear C-4520, Purex CF 105 (MICROBAN), 1 Cartridge Replacement cartridge for super star clear c-4500 swimclear C-4520 and purex CF 105 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-7489 and filbur FC-1275; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algae Measures 7-inches in diameter by 25-1/2-inches in length and 3-inches of top and bottom hole diameters