Pleatco PSG27.5Ps Replacement Cartridge for Saratoga Spas Circulation Pump, 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 11/3/8-by-1-1/4-inches SAE with handle Made in the USA