The given process compares the steps of two differents filter system for purifying water.
Overall, it can be seen that there is a two simple and cheap method for water purify. The basic formula for water purify is same in both system.
In the cross-section filter, there is a 200-litre container which has an inlet on the top. The third part of the container has sand, where through the inlet water is sent and is filtered. Below the send are layers of tiny stones and after the layers are pipes with hols. water passed through the three layers the water is used for household purpose
In the second system, the untreated water is stored in a container that has a tap. When it is opened, the water is sent to the other container with sand. After that, the water is sent back to the storage in another container that has a tap from which the water is used for housework. 
The  
given
 process compares the steps of two  
differents
 filter system for purifying water. 
Overall
, it can be  
seen
 that there is a two simple and  
cheap
 method for  
water
 purify. The basic formula for  
water
 purify is same in both system.
In the cross-section filter, there is a  
200-litre
  container
 which has an inlet on the top. The third part of the  
container
 has sand, where through the inlet  
water
 is  
sent
 and  
is filtered
. Below the  
send
 are layers of tiny stones and after the layers are pipes with hols.  
water
 passed through the three layers the  
water
 is  
used
 for household purpose
In the second system, the untreated  
water
  is stored
 in a  
container
 that has a tap. When it  
is opened
, the  
water
 is  
sent
 to the other  
container
 with sand. After that, the  
water
 is  
sent
 back to the storage in another  
container
 that has a tap from which the  
water
 is  
used
 for housework.