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

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

Next,

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under high pressure, the

water

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

After

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this

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stage filtered

water

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particles pass

further

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stages,

whereas

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

water

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

as a result

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getting the potable

water

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.

Finally

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, desalinated

water

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is stored in a reservoir and

after

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apply

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served to people by an integrated

water

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supply system.