chloride CaCl2. This is a form of calcium that may be added to reef tanks to maintain the calcium level. However, kalkwasser (calcium hydroxide) is preferred, as adding kalkwasser does not upset the alkalinity or ionic balance the way calcium chloride can.
Short for calcium chloride-water solution used to fill tractor tires for ballast.
A mineral that is the major building block of corals and other calcareous organisms. In a reef tank, calcium levels should be maintained between 380 and 480 mg/l. Calcium levels can be maintained through regular water changes, by using calcium additives, or through the use of kalkwasser.