Product parameters: -Material:Plastic -Packing list:4 * cotton filter [Good filtration]Our foam filter cartridge has a high-density mesh structure that filters a wide range of impurities in the swimming pool, effectively removing leaves, grass and hair. , scum, pine trees, insects and other floating matter. [Durable] This foam filter is made of high-quality sponge, which is flexible, not easily deformed, environmentally friendly, and can be reused after cleaning for a long service life. [Cost saving] Replacing filter cartridges is part of your daily pool maintenance, regular replacement of paper filter cartridges will result in higher costs and waste. Washable and reusable foam filters are an ideal alternative to disposable paper filters. There is no need to replace filter sponges frequently. [Widely used] Our washable foam filters are suitable for most swimming pool filters on the market. To keep pools, aquariums, hot tubs, and spas clean, we recommend replacing them every two weeks for better filtration and to keep your pool clean.