High quality material: washable sponge, the filter is made of high quality polyester fiber, good flexibility, strong rebound, strong and durable. Size: diameter: 93 mm Length:102 mm Opening: 30mm Suitable for Intex swimming pools and spas as well as spa pools, baths and aquariums bubbles and pure jets. . Inexpensive: This foam filter lasts longer than your cartridge and can be cleaned and reused multiple times. Replacing the filter element is part of the daily maintenance of the water tank. Regular replacement of filter elements can be costly. A reusable foam filter can reduce your costs. Easy to use: The foam filter has good flexibility and high elasticity. You can use the foam filter directly the water inlet of the filter. . Attention: it is recommended to change a box every week. This foam filter has a longer life than conventional ink cartridges because it can be cleaned multiple times. The foam filter can be used within the last two months. Foam filter life is influenced by filter performance, water temperature and the use of cleaning agents. .