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First ,sceens keep large objects .Then chemicals are added to stick to pollutants.The water and chemicals are mixed. Heavy pollutants fall to the bottom of the settling tank. Water flows through sand to filter small particles . Pumping station. Chlorine ,fluoide ,or other chemicals may be added at the end of treated water. Next, the treated water is pumped to the top of a water tower. Gravity pulls water down from the tank.

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