potable water

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5 Terms

1
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what is potable water?

  • water that has been treated

  • water that is naturally safe for drinking

2
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is potable water pure water?

  • no

    • pure water only has H2O molecules

    • potable water has other dissolved substances

3
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how is water from fresh water sources treated?

  1. filtration

    • wire mesh removes large twigs

    • gravel and sand beds filter solid bits

  2. sterilisation

    • harmful bacteria killed

    • bubbling chlorine gas / using ozone / using ultraviolet

4
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how can water be desalinated for palces with not enough surface/ground water?

  • distillation

  • reverse osmosis

    • membrane only allows water molecules to pass

5
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what are the disadvantages of distillation and reverse osmosis?

  • lots of energy

  • expensive

  • not practical for large quantities of water