【High-quality material】: The Intex S1 model measures approximately 108 x 73 mm (L x W). The swimming pool filter cotton is made of high-quality polyester fiber, which is strong and durable. Our swimming pool filter sponges are suitable for Intex S1 models and most swimming pool filters on the market. to keep your pools, aquariums, and spas clean. 【Cost Saving】: Regularly replacing paper filter elements is part of daily pool maintenance, which increases costs and causes waste. Our reusable and washable filter sponges are an ideal alternative to disposable filter papers. You don't need to replace the filter sponge frequently. 【Keep Water Clean and Fresh】: The sponge cover directly covers the water inlet of the filter. Effectively adsorbs particles and sediments, thereby improving biological filtration effects. Good elasticity, strong tensile force, fast dust filtration speed and high dust filtration rate, allowing you to enjoy a safe and healthy massage spa experience. 【S1 Type Filter