Features: Cartridges should be replaced regularly to maintain the efficiency of your filter. Replacing the paper filter element is part of the daily maintenance of the tank. It is easy to clean and replace. Fine workmanship, your pump perfectly. You should see the foam filter last for about 2 months. These reusable cleaning foam filters will lower your cost. Premium-quality material: The product is made of high-quality sponge material,durable and long-lasting. Practical in Use: The filter is suitable for filter type A, which will meet your needs. Specifications: Type: Filter Cartridge Material: PU Sponge Color: Blue Center Hole Drilled: approx.40mm Product size: 200 x 100MM Package Size: 13*8*2cm Package Weight: 25g Package Included: 1 x swimming pool filter sponge