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 flow diagram provides information on how salt is eliminated from the seawater in order to make it drinkable, highlighting the key phases from the initial inputs to the final outputs.

Overall

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, each step has its own role;

for instance

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,

the first step is

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just about removing the obvious impurities,

whereas

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the next step focuses on the tiny materials.

However

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, the nature of the processes varies slightly. As the chart illustrates, the seawater enters the pre-treatment filter process to clean it of large wastes,

while

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the water is forced to remove small impurities and salt by the membrane at high pressure.

Furthermore

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, the filter backwash and seawater concentrate, which are produced from the previous processes, are returned to the sea.

Finally

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, the cleaned water is treated with lime, chlorine, and fluoride before reaching storage to be stored.

In addition

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, there is a tap at the storage to supply the water to other integrated systems easily.