Sealey Dellonda Swimming Pool Filter Cartridge DL35Easy to install and change as no tools are required. Simply remove the old filter and replace with the new. (It's suggested to replace the filter cartridge with a new one every 3 4 weeks). The filter cartridge is mounted in the filter pump and catches the excess dust, dirt and grime to optimise the performance and lifespan of the pump. Remove and wash the filter cartridge under a garden hose to remove loose particles from the filter's fabric. For