Where should chlorine injection be performed to avoid corrosion problems?

Chlorine injection is ideally performed on the intake side of the pump to minimize the potential for corrosion problems in the system. Injecting chlorine at this point allows for the chlorine to be thoroughly mixed with the water before it moves to the distribution system, ensuring effective disinfection. Additionally, doing this before the water is subject to pressure reduces the risk of localized high concentrations of chlorine, which could lead to corrosion of pipes and fittings downstream.

The other options are less suitable for chlorine injection due to various reasons. Injecting at the water treatment facility may not address the risk of corrosion effectively since chlorine could react with certain materials in the treatment process, potentially leading to corrosion issues in distribution pipelines. Conducting the injection directly in the distribution system could result in uneven distribution and localized high chlorine levels, further increasing the chances of corrosion. Lastly, injecting chlorine before water enters the well does not align with practical methods of disinfection since the well itself would not benefit from disinfection that impacts subsequent processes.