What you're suggesting is chlorine in combined form called amines; it can be mono-chloro amine, di-chloro-amine etc It is usually not in excess and it's done to take care of any re-contamination in the distribution system due to leakage and suctions back into the pipe due to pressure loss for any reason.

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What you're suggesting is chlorine in combined form called amines; it can be mono-chloro amine, di-chloro-amine etc It is usually not in excess and it's done to take care of any re-contamination in the distribution system due to leakage and suctions back into the pipe due to pressure loss for any reason.

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Chloramines are a different thing to ensuring that there is an adequate free chlorine residual for disinfection. Chlor amines are not strong disinfectants and so it is usually important to disinfect with free chlorine and then convert to chloramine for distribution. Many operators prefer to ensure that the time part of concentration time multiple is maintained rather than making up for poor contact time with high chlorine.  

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