If your pH is truly over 8.2, then you need to use a little muriatic acid to lower it. However, depending on how high your chlorine was when you tested the pH, your pH reading may be falsely high. So, when your chlorine drops below 5ppm, retest the pH. If it still tests over 7.8, lower it. Please read the link in my signature below about using muriatic acid safely.

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