If you mixed with RO water then dripped slowly it shouldn't effect PH. I drip calciuim hydroxide slowly and it has a PH of over 12. It's all in how fast you add it. If my PH is a little low I drip faster.
First off I am by no means a chemist, but the dose for cal. chloride is not the same as cal. hydroxide [kalkwasser]. The little amount you use of the chloride is not going to effect the volume of water in your tank. I have a 240 gal. tank, loaded 90 % with sps and dose 1 tablespoon daily of cal. chlor. to maintain my cal. level. The main purpose of calc. hydrox. is to help maintain ph when using a calc. reactor, as the CO2 used to melt the media in the reactor lowers ph in the water column. Most calc. reactors operate at about 6.7 ph in the chamber to melt the media. Kalk can be used to maintain calc. and alk. to a small degree in a low demand system, but if you were to add enough to maintain a high demand system the ph would go sky high. Not being a chemist, I'm not sure calc. hydrox. could maintain the calc. level, even forgetting about the ph problem. I know that calc. chlor. doesn't effect alk. either, and that is why we also dose baking soda. Anyway back to your question, I just mix a tbls. with a pint of ro water and pour in the sump every evening, have had to increase the amount as the corals have started to get bigger.
