Quote from the bottle: (Unique dual method approach to coralline algae acceleration. 1. Ionic calcium: Immediately raises dissolved calcium levels in your aquarium water. 2. 10 micron aragonite: Targets the live rock surface, where it dissolves in situ, delivering calcium, strontium, magnesium, and carbonate right where it is needed. It also replenishes iodine.)
Hope that helps.
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