The provided diagram illustrates the contruction of water filter and functions to produce clean drinking water.
Overall, evan a cursory glance the the picture is adequate to indicate that , there are many steps involve in water filter assembly.
A further analysis of the process chart reveals that, first of all, plastic lid of first drum is opened and then water is put into first drum. in this water is crossed form three different layers first layer is sand second one is charcoal and last is gravel. After that filter water go in the storage drum with a piep.In the bottum of second drum a tap is connected for producing drinking water.
All the stages and material like sand, charcoal and gravel are necessary bucause if any stage is missed then the process can not work properly.
