Juwel BioPad XL Poly Pad for Bioflow XL (8.0). These are the first stage in the Juwel's filtration and removes all the fine particles preventing the other foams from blocking up as often. Replace the poly pad on a weekly basis to keep your aquarium crystal clear. x 5 Biopads per pack. Suitable for JUWEL Rio 400, Vision 450 & Trigon 350.