Many reef organisms depend on calcium. Small polyp stony corals (SPS), large polyp stony corals (LPS), clams, live rock, calcium based algae and other invertebrates can consume calcium at an amazing pace and the water in your system can become low in calcium if not replaced, resulting in poor health, slow growth and instability of your captive reef system. One of the most important aspects of successful reef keeping is stability, and many calcium replacement methods do not support this basic concept. Dosing two part additives results in a rise and fall in calcium levels and, in addition, require constant monitoring to ensure dosing is adequate. Once tuned to the demand of your system, a calcium reactor will provide a stable source of calcium for your reef organisms to thrive and grow, as well as eliminate the need to continuously dose other forms of replacement meaning less work for you as well.

A calcium reactor operates by dissolving the calcium based media inside. This is accomplished by lowering the pH of the water within the chamber with the addition of CO₂ gas. The water circulating within the system slowly dissolves the media and the effluent, or water leaving the reactor, is rich in calcium with a high alkalinity.