The sponges are made of environmentally friendly material, which will not pollute the water or the environment, and can help keep your pool or spa clean and clear. Changing your filter cartridge is part of routine pool maintenance, and frequent replacement of disposable cartridges may increase maintenance costs. These washable and reusable foam filters offer a cost-effective alternative. The initial cost is slightly higher than a standard paper cartridge, but they last significantly longer. This foam filter is designed for multiple uses and can be rinsed and reused several times. While paper cartridges may require weekly replacement, these foam filters can be cleaned and reinstalled. A foam filter typically lasts around two months with proper care. Model Number: for Intex Type A Type: Swimming pool foam filter sponge Color: Blue Material: Sponge Size: 20x10cm Package Contents: 10 x Pool Foam Filters Note: Only the items listed above are included; other products are not included. Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement may vary by +/- 1-3cm due to manual measurement.