The diagram provides key 
informations
 about the process of collecting the Change the wording
information
pieces of information
rain 
Correct your spelling
rainwater
water
 to using it to drink in one nation (Australia).
Use synonyms
Overall
 , it is clear from the graph that the process includes about 7 stages, starting from Linking Words
colecting
 the rainwater and Correct your spelling
collecting
selecting
ends
 with producing clean drinking Wrong verb form
ending
water
.
Use synonyms
According to
 what is shown, Linking Words
firstly
 they Linking Words
colect
 the Correct your spelling
collect
rain 
Correct your spelling
rainwater
water
, Use synonyms
Linking Words
secondly
 the Add a comma
secondly,
water
 goes to a Use synonyms
water
 filter, after Use synonyms
that
 they put all of the clean Add a comma
that,
water
 in Use synonyms
a 
big storage. 
After Remove the article
apply
that
 the Add a comma
that,
water
 goes throw a Use synonyms
thin
 and small tube to Correct word choice
small thin
onther
 storage for the treatment process. There is a small room to Correct your spelling
another
saprait
 the chemicals from the Correct your spelling
spray
water
. And Use synonyms
then
 the Linking Words
water
 goes the houses throw a Use synonyms
water
 tape and it's Use synonyms
finally
 ready to use.Linking Words