In answer to your question:
When chlorine is added water supplies it can react with other dissolved substances in the water and produce unwanted
chemicals, called "disinfection by-products". This natural organic matter comes from plants and/or animals that break down
into smaller components and dissolve in the water. These by-products tend to be organic compounds - the most common class being known as ...
What is the objection to using chlorine gas to disinfect wastewater effluent, and suggest two alternative substances that can be used without causing this problem.
A explanation is provided