Balance is meticulously designed to restore and maintain optimal General Hardness (GH) levels in aquariums while supplementing essential minerals. Ideal for use with reverse osmosis water or other mineral-deficient water sources, Balance does not contain sodium or chlorides. Directions: One scoop of Balance will raise the GH of 100L of water by 3 dH (1 meq/L). Do not dose when topping off evaporated water. Add Balance to water change water only. Adding Balance to the aquarium may cause a slight haze, which will dissipate within an hour.