Calcium Reef Advantage is a non-harsh blend (pH 8.3–8.6) of ionic calcium designed to restore and maintain calcium levels found in natural seawater. Calcium and calcium carbonate are essential for all types of coral growth. If either is deficient, coral growth will cease, leading to a rapid decline in coral health.

Calcium Reef Advantage also contains magnesium and strontium in amounts proportional to typical usage ratios (100:5:0.1, Ca:Mg:Sr). This allows for the maintenance of these two important elements while preserving calcium. Unlike limewater (kalkwasser), Calcium Reef Advantage does not have a harsh pH and will not deplete magnesium. When used as directed, it will not deplete alkalinity.