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Multiple forms of bio active & bio available high purity calcium. Calcium is an essential major component / element / ion in natural sea water (NSW). Calcium is found at 400 parts per million (ppm) at 77F / 25C at a salinity of 35 parts per thousand (ppt) or a specific gravity of 1.026. Aqua Cal® is a unique blend of highly concentrated forms of pH balanced, bio-availableTM, and bio-activeTM high purity calcium. Aqua Cal® replaces various essential forms of calcium that are consumed by captive marine life in their normal metabolic process. Multiple forms of essential calcium are employed as they are found in NSW. Aqua Cal® is ideal to maintain and accelerate coral growth along with coloration and natural health. Maintain Ca at 400 ppm. for sea water duplication.