This Replacement filter cartridge can handle the top load of 25 square foot and is best fit for Icon Spas, Weslo Spas, Image Spas. It replaces Unicel # C-4329, Pleatco # PIC25 and Filbur # FC-0210 and it complies with OEM # 176380 specifications. It is 12 inch long and 4 ¼ inch wide filter cartridge made of top quality of materials. It has semi circular handle on its top while 2 inch open hole it the bottom. By installing this filter cartridge you get complete protection from sand, dust and worms. Very easy to install this filter cartridge is made of high quality of materials.