The Unicel C-8326 Pool Replacement Cartridge Filter is designed for hot tubs and spas, featuring 125 square feet of 3-ounce basis weight media made of 100% polyester Reemay material. This cartridge filter ensures high performance and dependable filtration over time, with uniform pleats and Reemay media that provide higher dirt-holding capacity and longer time between cleanings. The filter's smooth surface makes maintenance easy, resisting degradation from chemicals and holding up to multiple cleanings. With durable plastic end caps and a 1-1/2-inch male slip fitting, this filter is designed for optimal lifespan with routine maintenance and proper spa water chemistry.