Tetra Aqua Easy Balance Aquarium Treatment eliminated the need for frequent water changes. Tetra EasyBalance keeps aquarium water biologically balanced for 6 months and stabilises pH and alkalinity (KH) levels for fish and plants. TetraAqua Easy Balance Aquarium Treatment reduces phosphate levels for improved water quality. and adds vitamins and trace elements. Use 1 teaspoon per 5 gallons weekly. Freshwater use only