Replacement cartridge for dynamic series iv - dfm, dfml, waterway 35, in-line * 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-4335 and filbur fc-2385; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea * Measures 5-inches in diameter by 9-1/4-inches in length and 2-1/8 inches in top hole and 2-1/8-inches in bottom hole diameter