Pleatco PA80 Replacement Cartridge for Hayward Star-Clear II C800 Star-Clear II C1500, 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 17-3/8 By 8-1/2 By 4 Inches