Alkalinity is the second part supplementation to Calcium. Calcium is a building block to your reef. As animals uptake calcium for biological use, it must be replenished. Calcium must be dosed in correlation with Alkalinity and Magnesium. Do not add Calcium and Alkalinity simultaneously or mix them together.

Directions: Shake prior to use. Add 1 capful (5mL) per 25 gallons of aquarium water 3-4 times per week.