General description 100% brand new and high quality, this reusable foam filter cartridge is designed for Bubble and Jetted Pure spas, serving as a replacement for the S1 carton. Replacing the filter elements of the paper filter is essential for daily pool maintenance. The cleaning and reusable foam filters will help reduce your costs over time, as they can be washed and reused multiple times, offering a longer lifespan compared to traditional cartridges. Technical specifications Size: 10.8 x 7.3 cm Center hole diameter: approximately 4 cm Color: Blue Material: Sponge Package Contents: 80 x Filter Sponges Recovery time for compressed product: 2 hours Measurement allowed error: +/- 1-3 cm