Shake vigorously for 10 to 15 seconds immediately before each use. Add 5-10 mL (1-2 tsp) per 55 gallons of aquarium capacity directly to an area with high water flow each day until target calcium and alkalinity is reached. Note, due to its high concentrated formula, dosing will cause cloudiness that will dissipate within an hour. It's recommended that Coralife Purple Tech be added to the system at night, in order to counter the natural tendency for pH to decrease during this time. It also allows for the aquarium to clear.