Brand: Unicel QUALITY REPLACEMENT FILTER: High quality 50 square foot filter media replacement cartridge that is made in the USA COMPATIBILITY: The C-4950 is an upgrade to 25 sq.ft. C 4326 and C 4625 cartridges MATERIAL: Heavy-duty polyester is designed to last far longer than cheaper alternatives. Also features more pleats for improved filtering capacity SIZE: Dimensions: 4.93 x 4.93 x 13.31 inches | Diameter (in): 4.93 MODEL: Model C-4950 hot tub and spa replacement filter cartridge with a 1-year manufacturer warranty SKU: C-4950 Category: FILTRATION Brands:Unicel