The addition of chlorine at intermediate points generally at service reservoirs and booster pumping stations in water supply distribution is called _____.

Correct option is A

→ Post chlorination is the application of chlorines to water before it enters to the distribution system,
→ Pre chlorination is the addition at intermediate points generally at service reservoirs.
→ Pre chlorination is done during coagulation and or during filtration.
→ If chlorination is done after filtration or it is the last treatment given to water is termed on post chlorination.