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 layout portrays the steps of converting impured

water

into pure prepared for drinking.

Overall

, it is a three-stage man-made process using machines to purify dirty

water

into clean

water

.

at

Change the preposition

in

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the beginning, unclear

water

is poured by hand into a large cylindrical plastic barrel covered with a plastic lid. Inside

this

container, the

water

will pass through three drums. The first one is the largest storage drum that will store

water

above.

Water

will pass from it to enter the sand layer in the second drum.

Furthermore

, the

water

will continue to move

reaching

Change the verb form

to reach

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the third drum that contains two layers of a small amount of charcoal

as well as

adequate gravel.

Water

is now ready to be transferred to another huge saving barrel through a connection that links the two barrels together. The

water

will be stored in

this

drum and it is completely clean to be consumed for drinking.