The 75 Sq. ft. Pool &Spa Filter Cartridge is designed for optimized function and endurance, including highly technological bands that are fairly impervious to breakage, and material consisting of Reemay media and polyester, which reinforce strength. Along with these features is the antimicrobial end caps that implement a detailed and thorough filtration system, expelling potentially harmful substances and forms of bacteria and mold. Inside of this structure include pleated formations, which are engineered to further promote the extended lifespan of this product. The cap system alone is a prime indication of this pool filter’s ability to sustain and preserve itself. This swimming pool filter also features a PVC center core and a sufficiently capable durable outer surface that can withstand myriad environmental conditions without fail.FeaturesArea - 75 sq. ft.Top/bottom - 3 1/16 in. OpenReplaces the Waterco Trimline C-75, Waterco 62044, Unicel C-7478, Pleatco PWC75, and Aladdin 17522