High quality material: washable sponge, the filter is made of high quality polyester fiber, good flexibility, strong rebound, strong and durable Size: diameter: 93mm; Length:102mm; Aperture: 30mm; Suitable for Intex pools and spas as well as pure jet and bubble spa pools, baths and aquariums. Inexpensive: This foam filter lasts longer than your cartridge and can be cleaned and reused several times. Replacing the filter element is part of the daily maintenance of the water tank. Regular replacement of filter elements can be expensive. A reusable foam filter can reduce your cost Easy to use: The foam filter has good flexibility and high elasticity. You can use the foam filter directly at 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. The life of the foam filter is influenced by the performance of the filter, the water temperature and the use of cleaning agents.