The filter cartridge is mounted in the filter pump and catches the excess dust, dirt and grime to optimise the performance of the pump and ensure clean and safe water. (It is suggested to replace the filter cartridge with a new one every 3-4 weeks) Use with Dellonda Model No. DL22 or any pump that is size compatible. No tools required, just remove the old filter and replace with the new. Remove and wash the filter cartridge under a garden hose to remove loose particles from the filter's fabric. For optimum cleaning and extended filter life, use in conjunction with Dellonda Model No. DL56 Cartridge Cleaner High filtration capacity - 1000gal/hr. Dimensions - Full Diameter: 106mm, Length: 203mm, Top Hole Diameter: 55mm, Bottom Hole Diameter: 203mm. IMPROVES WATER QUALITY - The filter cartridge is mounted in the filter pump and catches the excess dust, dirt and grime to optimise the performance of the pump and ensure clean and safe water. (It is suggested to replace the filter cartridge w