"It is a highly concentrated, fast dissolving powder which increases alkalinity (carbonate hardness) and stabilizes the pH at the correct value. In these ways it contributes significantly to the health of all aquarium inhabitants including corals, coralline algae and fish. Depending on the package either a measuring beaker (gradation marks at 10 and 20 ml) or a scoop is included (7 level scoops = 10 ml). Add it in high flow area or pre-dissolve it in some freshwater (4 fl. oz. of water for each 10 ml of powder)"