"Time consuming water changes are a thing of the past with Tetra Aqua EasyBalance. Refreshing aquarium water is a vital part of good fishkeeping and is essential for healthy fish. EasyBalance offers long-term care for water for 6 months. In addition EasyBalance contains elements for encouraging healthy plant growth and it actively reduces nitrate and phosphates thus helping to control algae. EasyBalance has several key features adding to its success: Carbonate Hardness Additive, The appropriate amount of carbonate hardness is added to the aquarium water compensating for KH losses which occur as a result of nitrification, pH Stabilization; Stabilizes the pH value on a sufficiently high level preventing a drop to biologically harmful levels (pH crash) and produces a certain amount of CO2 preventing excessive pH values, Phosphate Removing Effect, In a standard aquarium (3gal) the phosphate concentration is reduced to zero during most of the 6-month period."