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). Every 10 ml powder per 25 gallons will approximately increase the alkalinity by 1.2 meq/L. This corresponds to an increase in carbonate hardness by 3.3 German Carbonate Hardness (dKH). To keep your corals and beautiful encrusting algae in good health you should maintain an alkalinity of approx. 2.8 - 3.2 meq/L or 7.8 - 9 dKH expressed in German carbonate hardness value. The Salifert KH/Alk Profi-Test allows you to measure in 0.1 meq/L increments. Keep out of reach of children! In case of contact with eyes rinse with plenty of water. Only for aquarium-hobby use. Contains carbonate and bicarbonates. It does not contain boron since the depletion is different in different tanks and is not linked to alkalinity or carbonate hardness depletion.