This replacement filter cartridge complies with the technical specifications as Unicel # C-4332, Pleatco # PMT25, Filbur # FC-1612 and OEM # 17-B1151. This 11 7/8 inch long and 4 15/16 inch wide filter cartridge is capable of handling the top load of 25 square foot and the most suitable for Advantage Mfg, Baker_Hydro,Emerald Spas, Martec, Sonfarrel, Viking Spas. It provides you clean and clear water in your spas free from germs and spas. Very easy to install this filter cartridge is made of high quality of materials.