Brad,
7.8 pH is generally considered to be the high end where chlorine production by the cell is minimal. 7.4 would be ideal, and will help to reduce the loading on the cell, and the %age setting.
Depending on your system, if you can keep a fairly steady pH with muriatic acid, and the TA at 100 - 120 ppm, you should have more time for swimming.
Pat
PS. It is not yet a sticky and am waiting to hear from Ben regarding this.
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