Calcium is one of the most prevalent ions in seawater, and is required for the formation of aragonite, the skeletal material of reef-building invertebrates such as corals, clams, tube worms, and their respective allies. In seawater, calcium is present at a concentration of approximately 412 ppm; in reef aquaria, maintaining calcium within a range of 412 - 450 ppm will enable corals and other reef-building invertebrates to grow rapidly when all other physical and chemical requirements are met.

• Highly-concentrated ionic calcium solution
• Increases the concentration of calcium in marine aquarium water to provide corals and other reef-building invertebrates with one of the most important elements required for growth
• Is ionic rather than chelated, and contains no unwanted organic material such as EDTA, gluconate, or polygluconate
• Over 50% stronger than most competing products
• Free of phosphate, silicate, and organic material
• Formulated by a marine scientist

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