2-part balanced calcium and alkalinity system for reef aquariums Helps establish calcium and carbonate ratios found in natural seawater Provides the necessary elements for corals and other reef-building organisms Simplify calcium and alkalinity maintenance with this convenient, two-part method. When used together, Reef Code A and B helps establish the same ratio of calcium ions and carbonates found in natural seawater. Benefits reef-building organisms such as corals, clams, and calcareous algae by providing these organisms with the necessary building blocks in the proper proportions. Use Reef Code A and Reef Code B for best results. 17 oz treats up to 2,500 gallons.Please click on "More Information" for instructions and guideline.

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