1. Type A filter sponge, polyurethane material, size 200 x 100 mm (L x W) / 7.87 x 3.98 inches, package includes 2 filter sponges for swimming pool. 2. Round filter sponge, suitable for Intex A type water filter cartridges, filter equipment accessories, pool filter filters..., clean swimming pools, aquariums, improve biological filtration. 3. Reusable/washable swimming pool filter foam sponge, soft, not easy to deform, fast filtering speed, good air permeability, can be used for a long time. 4. The foam pool filter has high pressure resistance and elastic properties, corrosion resistance, environmental protection, and no peculiar smell. 5. Each round filter sponge lasts approx. 2 months, keep your swimming pool clean and free from germs. It is recommended to replace it once a week.