What is the maximum pH level of water when using chlorine as a sanitizer?

When using chlorine as a sanitizer, the maximum pH level of water should not exceed 10 because higher pH levels can significantly reduce the effectiveness of chlorine as a disinfectant. Chlorine works best in a neutral to slightly alkaline environment, with optimal efficacy typically around a pH of 6.5 to 7.5. As the pH increases, the proportion of hypochlorous acid (the active form of chlorine that effectively kills pathogens) decreases, and more of it converts to hypochlorite ion, which is less effective at sanitizing surfaces. Therefore, keeping the pH at or below 10 ensures that the sanitizer remains effective for food safety and sanitation purposes.