Juwel BioPlus Coarse Blue Sponge (size: BioFlow 3.0, M, Compact)

The coarse and the fine blue filter sponges house the most important bio - cultures, which are responsible to effectively clean the water.

You should clean or replace one sponge at a time every 3 - 6 months to maintain the right biological balance in your aquarium.

Please observe the maintenance guidelines in your instruction manual for further details.