Unicel C-4950 50 Square Foot Media Replacement Pool Hot Tub Spa Filter Cartridge with 212 PleatsBrand: Unicel Color: White Features: Replacement Pool & Spa Filter: C 4950 filter cartridge features 50 square feet (212 pleats) of 3 ounce basis weight media that catches debris and particles down to an average of 20 microns in size, keeping your hot tub water clear Optimal Debris Capture: Filter pool cartridge has sharp, uniform pleat folds that maximize water flow, minimize pressure loss, and allow full use of the pleat surface to hold more debris