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 growProvides calcium (140,000 ppm), strontium, magnesium, and potassium in approximately the same ratios* in which they occur in aragoniteVery strong source of carbonates (derived from aragonite), the other important group of ions involved in aragonite formationIncreases alkalinity to help stabilize pHStronger than competing productsMay be used as an inexpensive alternative to automated calcium reactor systems with similar resultsFree of phosphate, silicate, and organic materialFormulated by a marine scientistBasic Instructions: Shake product well before using. Add 5 ml (1 capful) of product per 50 US-gallons of aquarium water every other day or as needed to maintain the calcium concentration within a range of 412 - 450 ppm. When used in this fashion, 250 ml treats up to 2,500 US-gallons (9,464 L). Liquid Reef may temporarily cloud aquarium water after addition, therefore it is recommended that the product be dosed at night.