the diagram below shows a simple system that turn dirty water into clean water.

The

given

Verb problem

apply

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diagram

describes

Rephrase

below describes

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how a basic machine works to purify

water

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.

Overall

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,

this

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is a linear and manmade process to produce clean

water

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including 5 stages. It starts by filling a plastic barrel with unclean

water

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and ends by storing it in another drum that just contains drinkable

water

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. Looking at the diagram from a more detailed perspective, in the first stage, the plastic barrel is filled with unclean

water

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.

This

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has 3 different layers consisting of sand at the top, charcoal in the middle and gravel at the bottom. Each layer has a specific purpose

of

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for

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filtering. The sand layer helps remove contamination from

water

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. The charcoal filter eliminates the remaining chemicals

while

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the

last

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gravel filter improves the taste and flavour, making it easier to drink. In the following stages, the filtered

water

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is transmitted to another barrel, which is called the storage drum.

Finally

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, clean

water

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can be taken from the tap at the bottom of

this

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drum for drink.