New plaster pool - when to adjust PH?

Right away. And often, it'll be a battle for many months.

Pool School - Start-up New Plaster

No matter what start-up procedure is used, your pool will consume a lot of acid during the first 6-12 months as the plaster finish continues to cure. It is important to test your pH daily and do not let it climb above 7.8. Be sure to continue to brush the pool at least weekly during this period.
 
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