This replacement filter cartridge replaces Unicel # C-4308, Pleatco # POX25-IN and Filbur # FC-6305 and meets OEM # ELE-25-1 specifications. This 14 9/16 inch long and 4 15/16 inch wide filter cartridge is able to handle the top load of 25 square feet and is best fit for Advantage Mfg, Honey Tubs, Sonfarrel. This filter cartridge has 2 1/8 inch open holes both at its top as well as bottom. It is a high quality filter that provides you clean and clear water for your pools and spas. It provides complete protection from germs and spas. Very easy to install this filter cartridge is made of high quality of materials.