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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.
Recommended Action Levels for Free Chlorine for Disinfectants Chlorine and Chloramines A free chlorine concentration of 25 mg/L should be used as an emergency acute effects level for water treatment facilities employing chlorine or chloramines as disinfectants. Facilities which treat with the oxidants chlorine or monochloramine monitor in real- or near real-time the amount of total and or free or residual chlorine in the water that they treat. Assuming