Use the Tropic Marin Additional Cartridge Elimi-Control Phosphate to increase the capacity of the Tropic Marin Elimi-Control Phosphate filter system for aquariums with volumes of more than 600 l and for aquariums with extremely high levels of contamination. Use it also to expand a filter system to get a combination phosphate/discoloring organic substances in tanks with volumes up to 600 l if both phosphate level and discoloring organic substances need to be reduced simultaneously. Set up as an application as a bypass filter for an existing filtration system.