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The water we drink and use was running short. We all have to learn how to stop wasted water. One
of the step that we should take is to find ways of reusing them. Today in the most large cities, fresh water
is used only once and then it runs in a waste system. But it is possibly to pipe the used water to a purifying factory, when the used water can be treated with chemical materials by the workers so that it can be reused. But even if every large city purified and reused it¡¯s water, we still would have enough water.