This Replacement filter cartridge has the technical specifications as Unicel # 8409, Pleatco # PA90 and Filbur # FC-1292 and it complies with the OEM # CX900RE specifications. This 17 3/8 inch long and 8 15/16 inch wide filter cartridge has 4 inch open holes both at top as well as bottom. It can bear the top load of 90 sq ft and the most suitable for Hayward Star-Clear Plus C900, Sta-Rite PXC-95, Waterway Plastics. This is very easy to install filter cartridge and provides you clean and clear water for your pool and spas.