Pleatco PAP75-4 Replacement Cartridge for Predator 75 - Pentair Clean and Clear 75, Cal Spas, 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 16-1/8-by-6-by-6-inches Made in the USA