Provides calcium (140, 000 ppm), strontium, magnesium, and potassium in approximately the same ratios* in which they occur in aragonite. Very strong source of carbonates (derived from aragonite). Increases alkalinity to help stabilize pH. May be used as an inexpensive alternative to automated calcium reactor systems. Free of phosphate, silicate, and organic material. May be used as an inexpensive alternative to automated calcium reactor systems