Swimming Pool Filter Cartridge Specifications: (Please confirm the size you need before purchasing) Type: S1 Type Foam Filter Material: Sponge Dimensions: Approx. 108*73mm/4.25*2.87inch(L x W) Weight: 11.8g Contents: 2/4/6/8*Swimming Pool Filter Foam Features: 1. The filter element is installed in the filter pump and collects the debris flowing through the system. 2. Our filters filter out dust, hair, dirt and flies and can clean your water more effectively. 3. This foam filter can survive in the box and can be washed and reused many times. 4. It is recommended to replace one box per week and these foams can be easily cleaned and replaced. You should see the foam filter last about 2 months.