I had some horrible scaling issues when I opened the pool last year, supposedly due to the new plaster causing the pH to rise over the winter. This year when I closed it, I ensured that the pH was down around 7.1, and I also added a couple of jugs of ScaleTec in the hopes that it sitting in there with a low pH over the winter might eliminate the need for me to have the pool acid washed next year. I peeled the pool cover back yesterday and took a pH measurement (it's been about a month since I closed), and to my surprise, the pH was off the charts! Obviously this is not going to help my chances of not having to acid wash. Anyway...my questions are this:
1) What can I do to drop the pH when the pump isn't able to be run?
2) Why is the pH rising so much and so fast? I'm starting to wonder if there isn't an issue with the plaster/Diamondbrite job. Is it possible that my pool builder did something wrong that is causing the pH to rise, or is this a normal occurrence?
Any help is greatly appreciated!!