This is special blend made for us consisting of a mix of products to raise carbonate hardness (KH).Raises KH and neutralises PH almost instantly.Has the ability to raise and lower PH and keep it stable. 1 heaped teaspoon (5g) to 10 Litres of water will raise Carbonate hardness by approx. 7KH or 125ppm.Try it ,you will be amazed how good it is!