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GCSE Chemistry > Water Purification

There are 3 main processes undertaken in the water purifying process:
  • Filtration
  • Bacterial Oxidation
  • Chlorine Treatment
The different stages are listed in more detail below:
  • Water pumped from river into a reservoir
  • Water fed into sedimentation tank where solids settle
  • Sand beds filter out smaller particles
  • Chlorine added to water to kill germs
  • Sulphur Dioxide then removes the chlorine
  • Possibly, water is filtered through GAC (Granular Activated Carbon). This improves the taste and smell of the water
  • Possibly, fluorides added to water
  • Water is then pumped to its users

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