The diagram below shows how a simple water filter is constructed and how it functions to produce clean drinking water. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words.

The picture illustrates the construction of a simple

water

filter and how it functions to produce clean and suitable drinking

water

Overall

, the system includes some natural materials and basic equipment that can be used to produce drinkable

water

after

few

Correct article usage

a few

show examples

steps.

Firstly

, there are two tanks, the

tank

in

higher

Add an article

a higher

show examples

position is used to purify the impure

water

and the other one is used to

storage

Replace the word

store

show examples

clean drinking

water

. There are three natural materials inside the first

tank

: sand, charcoal and gravel, the main mission of those things is

removing

Change the verb form

to remove

show examples

bacteria and dirt

out of

Change preposition

from

show examples

the impure

water

. Two tanks are connected together by a pipe that runs from the bottom of

first

Change the article

the first

show examples

tank

into the side of the second

tank

.

Lastly

, a tap is equipped at the bottom of the storage

tank

to release the drinkable

water

. The process starts by lifting the lid of the first

tank

and pouring the impure

water

into the

tank

. The

water

passes through the sand layer at the beginning to remove residue, after that, the

water

then

goes to the charcoal layer, the charcoal can take some small dirt that people can not see out of the

water

.

Moreover

, the

water

has to pass through the gravel layer at the final to become clean, fresh and suitable for drinking.

Finally

, the

water

after being purified goes to the storage

tank

through the pipe and it can be released by the tap to use.