Which is worse, to have the pH read a little below 7.2 or a little above 7.8?

Chlorine prefers a lower pH level (7.2 to 7.5) where bromine works equally well throughout the entire range of 7.2 to 7.8. It is always best to keep the pH between 7.2 and 7.8 ppm, but there is more inherent danger in using a spa with a higher level than 7.8 versus level lower than 7.2.

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