Complete source of the elements and molecules that are directly used by corals clams and other reef- building invertebrates and organisms to create skeletal material and grow. Provides calcium (140000 ppm) strontium magnesium and potassium in approximately the same ratios in which they occur in aragonite. Very strong source of carbonates (derived from aragonite) the other important group of ions involved in aragonite formation. Increases alkalinity to help stabilize pH. Stronger than competing products. May be used as an inexpensive alternative to automated calcium reactor systems with similar results. Free of phosphate silicate and organic material. Formulated by a marine scientist. Liquid. 500-ml.