Upated on :August 9, 2009


Human life as well as plant and animal life depends on water.  The water which we use because of being salty and containing varieties of harmful substances can not be used directly and first it should be treated.  The young adults through studying this book become familiar with the processes of treating water.  We are grateful to acknowledge our debt to the Water and Sewage Engineering Organization for their Sincere cooperation as we prepared this book.

for larger view , please click on the image.