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INTRODUCTION 1.1 GENERAL The basic necessity for human life is food, dress, and shelter. Water is one of the important parameters to live in this world. Also, it is an important factor next to oxygen, the quality of water is the symbol of the standard of living. Poor water quality affects health conditions. Without water, we cannot imagine our life. So water is also added to the basic necessity of human life list. Even though water occupies 2/3 of the earth, only three percent of water is potable water and the remaining water is unpotable.