Juwel BioPlus L standard soft sponge for Bioflow L (6.0). The Juwel soft sponge filter media is designed to remove small to medium particles, and its design allows bacteria to thrive and reproduce thanks to its large surface area. It is recommended to change the BioPlus soft sponge every 3 to 9 months to maintain filter efficiency. Suitable for Juwel Rio 300/350 & Vision 260.