Reusable and Washable Filter: Instead of constantly changing paper filter cartridges, these washable and reusable foam filters offer a cost-effective solution. They reduce maintenance costs associated with regular cartridge replacement. Long-lasting: Although the initial cost of this foam filter is slightly higher than a paper cartridge, it offers a significantly longer lifespan. It lasts longer than paper cartridges. Reusable: Unlike paper cartridges that require frequent replacement, this foam filter can be washed and reused multiple times. It surpasses the longevity of paper filters while maintaining its effectiveness. Keep water clean and fresh: The sponge cover fits directly over the water inlet of your filter. Captures particles and deposits and improves biological filtration. Good elasticity, strong tensile force, fast dust filtration speed, high dust filtration rate, with this filter, you can enjoy a safe and healthy massage spa.