Calcium and Alkalinity are vitally important chemical parameters in reef aquariums. They are especially important in reefs with abundant populations of stony reef-building corals.
Calcium is one of the major ions in saltwater. It is the 5th most common ion in saltwater behind, chloride, sodium, sulfate, and magnesium. In most healthy reefs, the calcium level hovers around 425 ppm. Alkalinity is a little more difficult to explain than calcium. It is not a particular ion, but rather the buffering capacity of saltwater.
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