INTRODUCTION
Water has always played a prominent role in human civilization. When people first began settling in one place and growing crops for sustenance, it was invariably near water sources like rivers, lakes or ground water springs. Water was needed for drinking, preparing food, bathing, cleaning, irrigating crops and a variety of other tasks, so it was important to have ready access to this resource. The water sources used for supplying water were not always clean and water was treated in one way or other to i ....etc

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