Turbo-Calcium is a powder/granule that provides the calcium that corals and other animals require. It dissolves rapidly and will not affect pH. It is recommended that you drip-dose; rather than add the entire dose at once; simply to maintain the calcium at an even level rather than allowing it to spike suddenly. Calcium concentration in seawater is around 425-450 ppt; and aquarists strive to meet this same concentration in their tanks. Turbo-Calcium provides hobbyists with a simpler way to dose calcium versus the old kalkwasser way; which requires dosing equipment and can alter pH if dosed incorrectly. This form of calcium is highly recommended for well-stocked aquariums where other methods of dosing enough calcium can be risky. Many aquarists that currently use a successful kalkwasser system will often use Turbo-Calcium as a secondary source to keep their calcium at desired levels. Be sure to use a magnesium supplement with calcium Without appropriate magnesium levels; corals are unable to utilize calcium.