This is special blend made for us consisting of a mix of products to raise Carbonate hardness in African Cichlid tanks.It has been made to simulate water conditions in their natural enviroment.Has added potassium which helps with fish fertility.Helps to maintain stable PH levels.1 heaped teaspoon (8g) will raise Carbonate hardness by approx. 12KH or 215ppm and PH to approx 8.5 - 9.0.