Filter sponge: Type A filter sponge, polyurethane material, size 200 x 100mm (L x W) / 7.87 '' x 3.94 '', and the package contains 8 x pool filter sponges. Unique Design: The pool filter foam is made of PU sponge, soft, not easy to deform, filter speed fast; The foam swimming pool filter has high pressure resistance and elastic properties, a corrosion resistance, environmental protection, no smell, can be used for a long time. Easy to Use: This foam filter is very effective in cleaning pool garbage, such as leaves, hair, plastic bags and other small garbage which is not easy to clean. You get a clean pool, each filter sponge lasts about 2 months, keep your pool clean and keep it away from bacteria. It is recommended to replace it once a week. Wide range of applications: Our swimming pool filter sponge fits most swimming pool filters on the market. Keep your pool clean. The swimming pool filter sponge is made of PU sponge, which is soft and not easy to deform, and the filtering speed is fast. Reusable The foam swimming pool filter has high pressure resistance and elastic properties, corrosion resistance, no peculiar smell, and can be used for a long time. No water pollution The sponge is made of non-polluting materials and will not pollute the water and the environment.