Product Specifications: Length: 20 in. Outer Diameter: 7 in. Inlet/Outlet Diameter: 3 in (approx. 7.6 cm). Filtration Area: 1 x 50 sq. ft. Filter Material: Trilobal high-efficiency filtration fiber. Compatible Replacement Models: The GL-50-1 pool filter cartridge is compatible with the following models: GL-50-1, Hayward C500, CX500-RE, Pleatco PA50, Ultral-A11, PP-A11, Unicel C-7656, Filbur FC-1240, FC-0625, FC-0620. Note: This is a third-party compatible accessory. The listed brands and models are for reference only. is an independent brand. EPA Certification: This pool and spa filter cartridge are EPA certified. With 50-micron filtration precision, they effectively capture hair, leaves, dust, debris, and fine particles, ensuring clean and clear water. High-Efficiency Filtration Performance: Made from quality trilobal fiber filter material, the hot tub filter offers exceptional dirt-holding capacity, enhances system backpressure stability, and deep-cleans pollutants