Tropic Marin Bio-Calcium is the formula for healthy coral growth, Tropic Marin Bio-Calcium re-creates conditions in the aquarium equivalent to a natural reef. Only Carbon dioxide and calcium in the biologically ideal form are added to the water. In contrast to other calcium additives, the ion equilibrium is maintained with Tropic Marin Bio-Calcium. The pH-value remains stable.Tropic Marin Bio-Calcium+ biologically ideal calcium supplement for reef aquariums using the Balling Method+ the crystalline form means there is only one component instead of the usual three+ supply calcium and alkalinity without disturbing the ionic balance+ contains all 70 trace elements found in natural sea water+ no unnatural by-products+ exact dosages without prior dissolving+ will not alter pH of aquarium water when used as directed+ without phosphates and other pollutantsUse of Tropic Marin Bio-CalciumBio-Calcium increases both calcium and alkalinity at the same time. Calculate the total system water volume