General description The AlwaysH 6 Pack Reusable and Washable Foam Swimming Pool Filter Cartridge is designed for hot tubs and spas, specifically replacing the S1 type paper cartridge. Made from premium quality sponge material, these filters are soft, durable, and flexible, ensuring they do not easily deform or break. This foam filter is a more sustainable option compared to traditional paper cartridges, as it can be reused multiple times. Technical specifications Material: Sponge Dimensions: 10.8 x 7.3 cm Contents: 6 foam filters Usage Recommended to replace the filter once a week for optimal performance. Effectively keeps water clean and reduces bacteria in swimming pools. Compatible with Intex Bubble & Jetted Pure-spas. Other information All measurements are taken by hand; please allow a 1-3 cm error. Color may vary due to lighting and display differences; refer to the physical product received.