Made from filter paper, these cartridges efficiently impurities and particles, ensuring a clean and clear water Whether it ' s for your family ' s backyard pool or a public water park, these replacement filter cartridge safe and hygienic water for a refreshing swimming Suitable for all users of inflatable pools, whether at home or in resorts, hotels, and other public places Keep your inflatable pool clear with this set of 9 replacement filter cartridge Perfect for those who have high standards for water, such as children, individuals with sensitive skin, and those who are sensitive to water