Reef Calcium is a concentrated 50000 mgL bioavailable polygluconate complexed calcium intended to maintain calcium in the reef aquarium without altering pH. Polygluconate complexation confers several benefits it increases the bioavailability of the calcium it provides a rich source of metabolic energy to help maintain peak coral growth and it prevents calcium precipitationalkalinity depletion. Polygluconate contains no nitrogen or phosphorous thus it is biologically impossible for it to lead to algae growth in a properly maintained reef system. Maintains calcium Accelerates coral growth Will not alter pH li Reef Calcium may be used alone to maintain calcium but will provide enhanced levels of coral growth when used in conjunction with an ionic calcium supplement. Reef Calcium is intended to maintain calcium levels if calcium becomes seriously depleted one should either perform a water change or use an ionic calcium supplement to restore the depleted level of calcium.