Contains: 2 High Quality Filter Cartridges | Size: 13.3 * 5 inches (33.8 x 12.5 cm), inner diameter approx: 2.12 inches (5.4 cm), filtration area: 25 sq. ft (2.5 m) Compatible with Filter Cartridge PRB25-IN (PRB25IN / PRB25-1N / PRB251N) | Fits Pleatco PRB25-IN, Darlly 42513, Darlly Europe SC704, Unicel C-4326, Filbur FC-2375, Magnum RD25 Clean, fresh and healthy water provides you with an unforgettable, soothing SPA experience & incomparable quality swimming in your pool | The strong inner core in our filters includes a centre support for extra strength and durability assures a high pressure resistance. The reliable filter element filters out excess hair, leaves, deposits, sand, dust, dirt, oils, body lotions and bacteria on large filtration area | Pool filter is made from ultra-durable plastic and easy to clean Dacron filter material Easy to install and remove | You only need to put the filter cartridge into the pump and enjoy clean water It is important to clean these filters every 1-2 months (often with higher usage) and change filters regularly - be sure to replace every 12-24 months depending on use. It is recommended to replace the filter element to keep constantly water in pristine condition