Water for use in a town is usually purified from rivers and treated to reduce the impurity level in it.
The processes involved in water treatment are:
- Sedimentation – Here, the water is pumped through sediments of soils so as to filter it into a reservoir.
- Coagulation – The filtered water in the reservoir are coagulated by the use of alum so as to exposed some dissolved particles.
- Filtration – This is when the water filtered form dirts.
- Disinfection – Chemicals like chlorine are added so as to kill germs present in the water. Moreover, iodine and fluorine can be added to prevent goiter and tooth decay.