The diagram below shows how salt is removed from the sea water to make it drinkable. Summarize the information by selecting and reporting the main features, and make comparisons where relevant.

The diagram illustrates the stages of making seawater suitable for drinking by reducing the salt. In general, desalination is a cycled process which consists of a number of filtering stages starting from pre-treatment filtering and submitting with the storage stage.

Firstly

, the saltwater goes from the sea through a pretreatment filter before the main filtration.

Next,

under high pressure, the

water

is forced through a membrane, where impurities and salt molecules are eliminated.

After

this

stage filtered

water

particles pass

further

stages,

whereas

filter backwash and seawater concentrate return back to the sea. In the third stage, the filtered

water

is post-treated with lime, chlorine and fluoride for its disinfection,

as a result

getting the potable

water

.

Finally

, desalinated

water

is stored in a reservoir and

after

Change preposition

apply

show examples

served to people by an integrated

water

supply system.