This replacement filter cartridge has the technical specifications as Unicel # FC-2620, Pleatco # PPI25-4, Filbur # FC-2620 and OEM # C4428. With its 9 13/16 inch length and 4 15/16 inch width this filter cartridge can bear the top load of 25 square foot and it is the best fit for Santanna, Conger Bros. This filter cartridge has 2 1/8 inch open holes both at the top as well as bottom. By installing this filter cartridge you get complete protection from germs and sand in your pools and spas. It is very easy to install and made of superior grade of materials.