Water is purified in water treatment plants. Ground water is usually not needed to be treated because it is from aquifers. Surface water needs lots of treatment.
The process of water treatment:
1. Filtration - A wire mesh screens out large twigs etc. and then gravel and sand beds filter out any other solid bits.
2. Sedimentation - Iron Sulphate or Aluminium Sulphate is added to the water which makes fine particles clump together and settle at the bottom.
3. Chlorination - Chlorine gas is bubbled through to kill harmful bacteria and other microbes.
The water that comes out of our taps has to meet strict safety standards.Although this process has taken place, some pollutants are still found in tap water. These pollutants come from various sources.
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