well the first time ,1 month after adding liverock and aragonite, I tested it and it took twenty-something drops to do it. The second time, a little less.
That's the problem with that kit, if your calc is high, then you waste the solution.
It seems like they could come up with a dip test or a stick that you could drop in your skimmer tube and moniter the color of the stick. When the calcium gets low, the stick could lose it's color or something like that. I wish I were smart, I could make some money off an idea like this.