Chris already answered, but to go a little farther, if you add BOTH parts of a 2 part system at the same time, to a fresh water mix, chances are you will be "making sand" in the bottom of that container. (It will form a precipitate that is not very soluble, and may even turn the water to a milk color, which will reduce the amount that your corals have available.)
Back to my tank.... Water change is on tap today. I have about 20-25 gallons of fresh mixed RC ready to go. :D :D
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