Mike - the rising pH is definitely being caused by the curing gunite and plaster. Even after everything's cured, the SWG will continue to drive your pH upwards, although not quite as fast. I'm in the same boat having had our pool filled only on August 1st. I have to add 16 oz of Muriatic acid at 7:30 AM, then again 12 hours later, just to keep the pH around 7.4.
I'm told that this could last as long as 6 months, maybe even longer.
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