Brand New Filter – 2 Pack. The filter fabric with a precision of 50 microns is able to remove hair, leaves, dust, sediment, sand and other fine particles. The unique trilobal filtration fabric has a greater effective surface area, which can increase back press- sure throughout your entire filtration system, and provide you with clean, fresh and clear water. It is recommended to clean the cartridges every 2 weeks dependon usage to maximize your pool’s performance. Ft; Filter Material: Trilobal Filtration Fabric. Any questions please ask prior to purchasing.