Tropic Marin’s new Bio-Actif system just got a new product that has been added to the line. Liquid calcium is being touted as an additive that can balance your “PH in the long term by through the balance of individual substances by sodium chloride-free salt, the ionic balance in the basin is not disturbed. Unlike many other calcium additives, the pH value remaining constant.” To avoid precipitations, Tropic Marin Bio-Calcium Liquid Set has to be divided in three supplementary solutions: three bottles with three different liquids (A, B, C). The formula has been adapted in a way that the three different liquids can be dosed with the same quantity. These solutions should be added to the tank water separately either directly or by a dosing pump. Adding Tropic Marin Bio-Calcium Liquid as directed, creates highly efficient calcium supplementation to the aquarium while still maintaining the ionic balance and pH. Bio-Activ Calcium comes in two flavors, the liquid and then dry packets of the stuff which allows you to mix it with water for bailing applications. Over in Europe pricing isn’t to bad as the A, B, C solutions in 1000ml bottles will run you 24.50 euros ($32).