Waste water can be treated to produce potable water.
The stages of treatment include sedimentation, filtration, and sterilisation.
What is filtration?
Soluble salts are removed by adding a chemical precipitant
Insoluble solids are removed by passing the water through a mesh or beds of sand and gravel
Pathogens are killed by adding chlorine or ozone
Suspended particles are allowed to settle to the bottom of a tank
