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So since you are suing All for Reef the one cavate to using it is that the alk in carbo calcium (formate) will not show up as alkalinity unless and until something metabolizes it and releases the alk back to the water.
So basically it won't show up as alkalinity as soon as you add it or even...
Powdered version of supplements tend to be less potent. I know for instance the RedSea Alk liquid is much stronger than if you mix the powder yourself.