Juwel BioPlus M Fine Sponge for Bioflow M (3.0). The fine sponge filter media from Juwel is designed to remove small to medium-sized particles, and its design allows bacteria to thrive and multiply thanks to its large surface area. It is recommended to change the BioPlus fine sponge every 3 to 9 months to maintain filter efficiency. Suitable for JUWEL models Rio 125, Rio 180, Rio 240, Vision 180, Trigon 190, Lido 120, and Lido 200.