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How is water purified at a water purification plant?
 
Water purification process involves
 
 
Sedimentation
 
Large sedimentation tanks collect water from lakes and rivers. Then, it is left unused there to allow suspended impurities to settle to the bottom of the tank. A chemical compound like  is sometimes added to the water to speed up the sedimentation process. This process is called Loading.
 
Filtration
 
Filtration tanks contains
 
Water is pumped from the sedimentation tanks to the filter tanks. As water flows through these layers, any leftover  are fully removed.
 
Sterilisation

To remove any leftover , the filtered water is chemically treated. and ozone are the chemicals used in this process.