The sponges are made of environmentally friendly material, will not pollute the water or 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 pool maintenance, and regular cartridge replacement can be expensive. Washable and reusable foam filters will reduce your costs. The initial cost of this cartridge is slightly higher than a paper cartridge, but its lifespan will be much greater than that of a cartridge. A foam filter will outlast your paper cartridges and can be washed and reused multiple times. It is advisable to change a paper cartridge weekly, while foams can simply be washed and replaced. You should see a foam filter last about 2 months. Model Number: for Type A Type: Swimming Pool Foam Filter Sponge Color: Blue Material: Sponge Size: 20x10cm Package Contents: 20 Swimming Pool Foam Filters Only the above package content, other products are not included. Note: Light reflection and