, reusable foam filter. Suitable for Intex Bubble and Jetted Pure-spas. Replacement for S1 cartridge. Replacing the filter elements is part of regular pool maintenance. These washable and reusable foam filters help reduce ongoing costs. While the initial cost is slightly higher than disposable filters, the extended lifespan provides long-term value. More durable than paper filters and can be cleaned and reused multiple times. Size: 10.8 x 7.3 cm Center hole: Approximately 4 cm Note: Allow 2 hours for compressed product to fully expand Color: Blue Material: Sponge Package Contents: 16 x Filter Sponges Only the above package content is included; other items are not part of this package. Note: Lighting and display differences may cause slight color variation between the image and actual item. Measurement error allowance: +/- 1-3 cm.