• 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.
• It is ionic rather than chelated, and contains no unwanted organic material such as EDTA, gluconate, or polygluconate.
• Free of phosphate, silicate, and organic material.
• Over 50% stronger than most competing products.
• Formulated by a marine scientist.
• Available in 250 ml, 500 ml, 2 L, and 20 L sizes.

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.