Re: PH level
give us a bit more info about your pool and post a current set of test results and we can answer that
But, assuming you have not added anything that would raise pH, usually it's new plaster and/or
high TA.
If you have a SWG then you can also add CYA too low or unit undersized for the pool.
Also, If your pH is in normal range, you shock the pool, and retest pH when at shock level you pH will have appeared to spike but really hasn't. High chlorine levels chemically interfere with the pH test and cause it to read high when it is not. Once the chlorine drops to normal range the pH the pH drops back down to where it really is.
Retired pool store and commercial pool maintenance guy.
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