The calcium-bearing component of a two-part method for dosing calcium and carbonates (the substances largely responsible for increasing alkalinity (""buffering capacity"")) in the same ratio as that found in natural seawater, Ionically-balanced with respect to natural seawater concentrations of calcium and carbonates when used in equal amounts with Reef Code B, Benefits reef-building organisms such as corals, clams, calcareous algae, etc, Simplifies calcium and alkalinity maintenance, Stronger than most competing products, Contains no phosphate, silicate, or organic material, Formulated by a marine scientist, Liquid, 2-L, SKU: RYLHC1070