How does the process of desalination work?

There are TWO(2) methods of desalination.

1. Boiling the Salt water, collecting the steam and allowing it to condense. This is then pure water. The Salt is left behind; does not boil off. This is an expensive method as it involved the costs of heating to boiling point of salt water.

2. Osmosis. This method has a semipermeable membrane. The salt water is placed to one side of the membrane. The water molecules pass through the membrane and leave the salt behind. It is a much cheaper method as it does not involve the costs of heating salt water. It is generally the method used in dry/arid/desert climates in order to obtain a large quantity of fresh water.