I was following the instructions on the Pool Solutions website which suggests holding the pH low until the Alk has corrected. Those instructions say no lower than 6.6, or the bottom of the scale for the kit being used. The bottom two tiers on my kit are 6.8 and 7.2, so I have been keeping the color right between those two, probably close to 7.0. I am only doing that for this process and will let it come back up to 7.5 when the Alk is corrected. My goal is Alk 110, pH 7.5.