Disinfection

Treated water is disinfected with chlorine gas, chloramine, sodium hypochlorite, chlorine dioxide, ozone, or ultraviolet light before it is pumped into the water mains and storage tanks to be distributed to consumers.

Disinfection
Treated water is disinfected with chlorine gas, chloramine, sodium hypochlorite, chlorine dioxide, ozone, or ultraviolet light before it is pumped into the water mains and storage tanks to be distributed to consumers. In some plants, raw water is also prechlorinated after the screening phase to reduce the biological films in the treatment cycle. Prechlorination may also be used to oxidize and precipitate dissolved iron and manganese from the water. This prevents iron (orange) and manganese (black) from staining the consumer's sink and laundry. Water utilities may further increase chlorine levels (termed “rechlorinating”) in the distribution system to kill pathogens.

Here is a list of all the various methods of water treatment.

Screening or Sieving and Storage

Flocculation

Sand Filters

Types of Sand Filters

Disinfection

Desalinization

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