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pH and Chlorine values for good water quality. pH. The pH is a measure of the acidity of the water. The pH scale goes from 0 to 14, where pH 7 is neutral. If the pH is above 7, the water is basic; if it is below 7 the water is acid. The optimum pH for pool water is 7.4, since this is the same as the pH in human eyes and mucous membranes. A pH of 7.4 also gives good chlorine disinfection.
The pH balance of your water impacts the effectiveness of the chlorine in your water. The idea test reading for pH is between 7.4 and 7.6. If the test reading is below 7.2 then the water is more on the acidic side. A test reading above 7.8 indicates the water is more on the alkalinity side.