Use 1 level teaspoon for every 40 L (10 gallons) once or twice a month (or as necessary to maintain a pH of 6.5.) Arowana Buffer™ may be initially used daily in cases of high alkalinity until 6.5 is established. It may be added directly to the aquarium at any time. Ideally, it should be used when adding or changing water by dissolving in the replacement water.