General description 100% brand new and high quality, this reusable foam filter cartridge is designed for Intex Pure Spa. It is suitable for both Bubble and Jetted Pure spas, serving as a replacement for the S1 cartridge. Regularly replacing the filter elements is essential for daily pool maintenance, and using cleaning and reusable foam filters can significantly reduce your costs over time. Technical specifications Size: 10.8 x 7.3 cm Center hole diameter: approximately 4 cm Material: Sponge Color: Blue Package Contents: 48 x Filter Sponges Recovery time for compressed product: 2 hours Measurement allowed error: +/- 1-3 cm