Nima Moghaddam - Bachelor's degree in water engineering, Zanjan University
Farzad Bakhshandegan Moghaddam - Lecturer in the Department of Water Science and Engineering, Zanjan NationalUniversity
Yusef Moghaddam - Senior expert of water and sewage company of Qazvin province

Without water, life cannot be done, and many of human activities, development, progress, anddevelopment, are doubtless connected with water. Meanwhile, the sweet water in the lives of livingthings, plants, animals, and especially human beings, has a special significance. Human life's densitywas always in the neighborhood, where the sweet water was easy to find. From a distance, actually,the salt water has done no good to a man's life, unless there was some way to turn salt water intofreshwater that had never existed before. but nowadays, with science and knowledge, it may becomepossible. In about ۹۹ percent of the surface water is either too salty, or even if it is sweet, most of it isice - cold, and it is used for local cause or energy, so it is a little more than ۲ percent water supply inthe world, available to ۱, ۰۰۰ people. and that he had paid for it in various ways

salty water, freshwater, surface water