Replacement filter for pool and spa cleaning systems * 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-4950 and filbur FC-2390M; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algae * Measures 5-inches in diameter by 13-5/16-inches in length and 2-1/8-inches of top and bottom hole diameters