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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
