To get green water problems under control this cartridge can be used in place of the normal filter cartridge temporarily. Along with the sachets of treatment supplied it will remove the algae which causes green water. Follow the simple step by step instructions supplied to remove the algae and clear your biOrb water.This is a treatment cartridge, it does not prevent green water. The best way to prevent green water is to minimise feeding and carry out regular maintenance.

• To fit all biOrb aquariums. 
• 1 x treatment cartridge 
• 2 x treatment sachets 
• 1 x cleaning pad