The sponges are made of environmentally friendly material, it will not pollute the water as well as the environment,and can keep your pool or spa sparkling clean and clear day after day. Changing your paper filter cartridge is part of your routine maintenance for your pool and regular replacement of the cartridge can prove costly. These washable and re-usable foam filters will reduce your costs. Initial cost of this cartridge is slightly more than a paper cartridge yet will outlast a cartridge by a . This Foam filter will outlast your paper cartridges and can be washed and re-used several times over. Advises changing a paper cartridge each week, whereas these foams can simply be washed and put back. You should see a foam filter last around 2 months. Model Number: for Type A Type: Swimming pool foam filter sponge colour: blue Material: sponge Size: 20x10cm Package Contents: 6 x Pool Foam Filters 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.