Guardian Pool Spa Antimicrobial Filter Cartridge Replaces Unicel C-4995, Filbur FC-2940, Pleatco PCAL100 Replaces Pleatco PCAL100, Unicel C-4995, Filbur FC-2940 MEASUREMENTS: Diameter: 5'' Length: 23 5/8'' Top: Open Hole 2 1/8" Bottom: Open Hole 2 1/8'' Filter Area: 95 sq ft Reemay with Microban Antimicrobial Product Protection Antimicrobial end caps