Chlorine in drinking water is used for which of the following?

Chlorine in drinking water works mainly as a disinfectant, and also aids odour treatment and the removal of iron and manganese.

Statement 1 holds, as chlorine kills bacteria and viruses in the supply.

Statement 3 holds, since chlorine oxidises the compounds that cause taste and odour.

Statement 5 holds, because chlorine oxidises dissolved iron and manganese into removable solids.

Statement 2 fails, as hardness from calcium and magnesium is reduced by softening, not chlorine.

Statement 4 fails, since turbidity is controlled by coagulation and filtration rather than chlorine.

A small residual chlorine level is kept in the network to guard against recontamination.