The diagram below shows how salt is removed from sea water to make it drinkable. Summarize the information by selecting and reporting the main features and comparisons where relevant.

The diagram below shows how salt is removed from sea water to make it drinkable. Summarize the information by selecting and reporting the main features and comparisons where relevant.
The flow chart gives information about the process of producing clean
water
from saltwater so that it can be used for drinking.
Overall
, seawater has to follow four main steps to be drinkable, beginning with the pretreatment filter stage and ending with the storage stage. At
first,
water
that is
taken from the sea must go through the pretreatment step before filtration. Under high pressure, the treated
water
then
is forced through the membrane. The membrane only allows
water
molecules to pass,
thus
impurities and salt are eliminated. The waste of the first two steps, filter backwash, and seawater concentrate, are all given back to the sea
while
the main product is continued in
further
steps.
Subsequently
, the filtered
water
is post-treated with lime, chlorine, and fluoride in the third processing stage. The product of
this
final main step is drinkable
water
. Before being transferred into an integrated
water
supply system, clean
water
is stored in storage conditions.
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Basic structure: Change the fourth paragraph.
Vocabulary: Replace the words water with synonyms.
Vocabulary: Rephrase the word "information" in your introduction.
Vocabulary: Only 4 basic words for charts were used.
Vocabulary: The word "gives" was used 2 times.
Vocabulary: Use several vocabularies to present the data in the second paragraph.
Vocabulary: Use several vocabularies to present the data in the fourth paragraph.

Essentional vocabulary list for IELTS Writing 7+

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Topic Vocabulary:
  • desalination
  • intake
  • pre-treatment
  • filtering system
  • reverse osmosis
  • semi-permeable membrane
  • dissolved salts
  • impurities
  • post-treatment
  • minerals
  • palatable
  • distribution
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