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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.
Successful disinfection with hypochlorite depends on the chlorine demand of the. water to be disinfected and the wastewater pH. When NaOCl is added to water, it dissociates to form hypochlorous acid (HOCl) and hypochlorite ion (OCl-), collectively known as free chlorine, with a pK value for this reaction of about 7.6.