Juwel BioCarb M Carbon Sponge for Bioflow M (3.0). The filter sponge is enriched with active charcoal for binding odours, discolouration and toxic compounds in water. It is recommended to replace these sponge on monthly basis. Comes in 2pc per pack. Suitable for JUWEL Rio 125, Rio 180, Rio 240, Vision 180, Trigon 190, Lido 120 & Lido 200.