Calcium, Magnesium, Strontium and Carbonate are the basic foundation elements of coral skeletons. All of these elements need to be available in balanced proportions for coral health and growth. Reef Foundation B is a complex of carbonate and other buffers present in seawater that maintain proper alkalinity and pH, and is part of Red Sea's complete Reef Care program. 1 ml of Reef Foundation B will raise the alkalinity of 25 gallons of water by 0.36 meq/l (1dKH). Includes a convenient measuring cup for easy dosing.