Pleatco PPM25-4 Replacement Cartridge for Pacific Marquis 25, 1 Cartridge Replacement filter for pool and spa cleaning systems 50% 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 11-7/8-by-1-1/16-by-1-5/8-inches Made in the USA