Seachem Reef Advantage Calcium 250g is a non-caustic (pH 8.3–8.6) optimized blend of ionic calcium designed to restore and maintain calcium levels found in natural seawater.

Calcium and carbonates are essential for the growth of all corals. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health.

Reef Advantage Calcium also includes magnesium and strontium in amounts proportional to typical usage ratios (100:5:0.1, Ca:Mg:Sr). This allows you to maintain these two important elements while also maintaining calcium.

Unlike limewater (kalkwasser), Reef Advantage Calcium does not have a caustic pH and will not deplete magnesium. As long as it is used according to instructions, it will not reduce alkalinity.