The given diagram shows the sample of contaminated water was refined by three natural stages to generate clean drinking water for versatile uses.
Accordingly, to the diagram manifest using a large metal container, with adding three layers of different forms of soil, which was the first layer a gravel, charcoal and then sand.
Firstly, the process start with adding polluted water to the tank, then the water starts to refine through fine sand, after that the water pass into second layer which is charcoal, the sample water are finally, push through the gravel layer to percolate the entire contaminants of water to stabilize at the storage tank, which is attached to the tap water.
Overall, the process of impure water was depend on the natural materials are take it from our environment, which is percolated the polluted water through three stages to obtain potable water, which can be taken out for different uses. 
The  
given
 diagram  
shows
 the sample of contaminated  
water
  was refined
 by three natural stages to generate clean drinking  
water
 for versatile  
uses
. 
Accordingly
, to the diagram manifest using a large metal container, with adding three  
layers
 of  
different
 forms of soil, which was the  
first
  layer
 a gravel, charcoal and then sand. 
Firstly
, the process  
start
 with adding polluted  
water
 to the tank, then the  
water
  starts
 to refine through fine sand, after that the  
water
 pass into second  
layer
 which is charcoal, the sample  
water
 are  
finally
, push through the gravel  
layer
 to percolate the entire contaminants of  
water
 to stabilize at the storage tank, which  
is attached
 to the tap water. 
Overall
, the process of impure  
water
 was depend on the natural materials are take it from our environment, which  
is percolated
 the polluted  
water
 through three stages to obtain potable  
water
, which can  
be taken
 out for  
different
  uses
.