Reusable Washable Filter: Changing your paper filter is part of your routine maintenance for your pool and regular replacement of the can prove costly. These washable and re-usable foam filters will reduce your costs. Long Working Time: Initial cost of this is slightly more than a paper yet will outlast a by a . : This Foam filter will outlast your paper cartridges and can be washed and re-used several times over. Reusable Washable: Advises changing a paper each week, whereas these foams can simply be washed and put back. Keep Water Clean: Will be a great water cleaner for swimming pool. Fitment: For Type A Size(): 20x10cm() Center Hole Drilled: 4cm() It takes 2 hours for the compressed product to recover Material:Sponge colour:blue Package Contents: 8 x Filter Sponge Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.