Juwel Nitrax L Compact Nitrate Sponge for Bioflow L (6.0). The sponge is designed to reduce nitrate levels in the aquarium. This in turn helps reduce the amount of algae and helps provide a more healthy aquarium for your fish and plants. Nitrax is also a biological filter containing specialist microorganisms to break down poisonous metabolites in the aquarium. It's recommended to change the Nitrax sponge every 2 months for optimum performance.Suitable for JUWEL Rio 300/350 & Vision 260
