Equilibrium is specifically designed to establish the ideal mineral content for the planted aquarium. Equilibrium? contains no sodium or chloride (which can be detrimental to a planted aquarium at elevated levels). Equilibrium? is ideally suited for use with RO (reverse osmosis) or DI (deionized) water or any mineral deficient water. Equilibrium? raises the essential mineral/electrolyte content (General Hardness) of the water to balance with and promote stability of the carbonate hardness.