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 procedure

of

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for

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how

a

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apply

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drinking

water

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is produced by a

water

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-filter assembly.

Overall

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,

water

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passes through two

various

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storage

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drums with plastic lids on the top. The first

storage

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is

equiped

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equipped

with three different filters, including sand, charcoal, and gravel.

Initially

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, after removing the plastic lid,

water

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is poured into the first

storage

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drum, which is made

by

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of

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a plastic barrel. To remove impurities,

water

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passes through three different layers of filters.

Firstly

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,

water

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is confronted with a

layer

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of sand, next charcoal, the thickest

layer

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, and

finally

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a

layer

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of gravel. In these stages, each

layer

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plays a crucial role.

Consequently

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, the output is less contaminated. The second

storage

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drum is connected to the first one

by

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with

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the help of a pipe. In the next stage, filtered

water

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is conveyed by the pipe to the second drum, with a closed lid, to be prepared for the

last

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phase. After passing all the phases, drinking

water

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is available.