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Chlorine is added to tap water by many water supply departments. They add chlorine because it kills harmful bacteria and viruses in the water. Without chlorine, water can become unsafe and cause serious illnesses. So, in a way, chlorine is helpful for public health. But when chlorine stays in the water for too long, it becomes a problem. It affects the taste and smell of water, and many people do not like the strong chemical odor it gives.
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