The diagram below shows a simple system that turn dirty water into clean water.Summarise the information by selecting and reporting the main features, and make comparisions where relevant.

The diagram illustrates a simple

water

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-

filtration

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system designed to convert untreated

water

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into drinking

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.

Overall

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, the process consists of several stages, beginning with untreated

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being poured into a

filtration

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drum and ending with the filtered

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being stored and dispensed for consumption. The

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drum contains three layers of filtering materials—sand, charcoal and gravel—and is positioned above the

storage

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drum.

Initially

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, untreated

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is poured into the top of a plastic

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drum, which is covered by a removable lid. The

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then

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passes downward through successive layers of sand, charcoal and gravel, which filter out impurities. Once

filtration

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is complete, the purified

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flows through an outlet in the side of the drum and into a separate

storage

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drum positioned below it.

Finally

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, the filtered

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is stored in the

storage

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drum until it is required. When drinking

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is needed, the outlet tap at the bottom of the

storage

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drum can be opened, allowing the treated

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to be dispensed into a container for consumption.