If you are adding chlorine with a SWG or bleach or liquid chlorine or cal hypo, you need to lower the PH with acid. If you are using trichlor tablets, they will lower the PH for you.
What he said, but you're already getting up there with the CYA. Personally, I'd just use muriatic acid to adjust pH. It will fix the pH with half an hour of pump running,
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