Juwel BioPlus M Compact Coarse Sponge for Bioflow M (3.0). The Juwel BioPlus Coarse Sponge is designed to remove large to medium sized particles and within its design allows bacteria to flourish and multiply down to its large surface area. It is recommended to change the BioPlus Coarse sponge every 3 months to keep your filter running as efficient and possible. Suitable for JUWEL Rio 125, Rio 180, Rio 240, Vision 180, Trigon 190, Lido 120 & Lido 200.