Guardian Antimicrobial Pool Spa Filter Replaces Unicel C-7656 Pleatco PA50 Filbur FC-1240 Hayward CX500RE Star Clear C500 Replaces Unicel C-7656RA, Filbur FC-1240M, Pleatco PA50-M Diameter 7'', Length 19-3/4'', Top Open Hole 3'', Bottom Open Hole 3' Filter Area: 50 sq. ft. ilter Material: High-quality Reemay antimicrobial filtration fabric (equivalent to Microban antimicrobial product protection) Hayward, Pentair, Maax, Cal Spas, American Products, Vita Spas