The final treatment step is the addition of post treatment chemicals to the filtered water. Sodium hypochlorite is added for disinfection and ensures a residual disinfectant is available to prevent bacteria growth in the distribution system. Calcium hydroxide (lime) is added to adjust the pH of the water to improve the taste and to provide protection from corrosion of lead and copper in home plumbing systems. Lastly, fluoride is added for prevention of tooth decay.
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