The sponges are made of environmentally friendly material, which will not pollute the water or the environment, and can keep your pool or spa clean and clear. Changing your filter cartridge is part of routine pool maintenance, and frequent replacement of disposable cartridges can be costly. These washable and reusable foam filters help reduce ongoing expenses. The initial cost of this cartridge is slightly higher than a standard paper cartridge, but it lasts significantly longer. This foam filter is durable and can be rinsed and reused multiple times. While paper cartridges may require weekly replacement, these foam filters can be cleaned and reinstalled. A foam filter typically lasts around two months. 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 in color between the image and the actual item. Measurement may vary by +/- 1-3cm.