Chris, I'll assume your the Chris88 in this thread..
http://www.reefcentral.com/forums/sh...php?p=15912606
The post above your last comment explains the addition of carbon via acetate, and how it increases solubility of CaOH by 36%.
This is quoted from Craig Bingman in the Reef Aquarium, vol 3. I've also seen detailed articles by him explaining the reaction fully.