Pleatco PAP50-4 replacement Cartridge for Predator 50 - Pentair Clean and Clear 50, 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 8-5/8-by-6-by-6-inches Made in the USA