Thx Carl.
I wasn't sure abt chlorinating with such a low Ph so I held off. I assume the Cal-Hypo powder needs to be dissolved with water before going in the pool. From what I heard, the plaster is especially susceptible to chems while it's curing. In regards to bringing the Ph back up, is borax better than soda ash. If so why? Roughly how much borax would I need?

Thx for the reply. I need the input.
JC