14.2 - Water safe to drink

Potable water

Water that is safe to drink

Fresh water

Rain water that collects in lakes and rivers

How water is made fit to drink

• passing through filter bed

• adding chlorine or ozone

  OR

• passing ultra violet light through it

Water purified by distillation

Can be done but involves heating large amount of water - expensive

Desalination

Making seawater into potable water

Reverse osmosis

Uses membranes to separate dissolved salts from salty water

Uses a lot of energy