Pleatco PH6 Replacement Cartridge for Standard and High Sq. Ft. Module Filters, Lifeguard CL 9, Rainbow, Pac-Fab, 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 9-13/16-by-1-1/16-by-1-1/16-inches Made in the USA