Yep! Once you mix it, it's called Kalkwasser. :D And Mrs. Wages can be found at Walmart.
You'll most likely be able to get 1 tablespoon per gallon dissolved, but anything over that might require acid addition. I'd start with 1 tablespoon per gallon and see what that does to you alk and calc numbers.
Note that with a new tank with a few frags, you can get away with dosing by using lime in the ATO. Eventually, as the hard corals grow, the ATO method won't be able to keep up and you'll need to consider alternate means.
I add calcium hydroxide (Mrs. Wages, pickling lime) into my ATO top off tank. Not so much for alkalinity, but for CA. I would suggest dosing sodium bicarbonate (baking soda, not baking powder!) to raise and maintain your alkalinity
1 1/8 cup of sodium bicarbonate into a gallon of RO/DI water. Mix till clear/disolved and dose using this calculator :