High nitrate levels can encourage excessive algae growth which can make the aquarium look unsightly unlike other nitrate reducing products which need regular recharging and replacing tetra nitrateminus is simply added weekly to the aquarium also unlike many ordinary nitrate reducing products nitrateminus does not need to be added to a filter system to work but is simply added straight to the waterr how it worksr nitrateminus utilises a natural biological process called de nitrification