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Usually fluorine, in the form of stannous (tin) floride. The halogen chlorine is used widely as an oxidizer in water treatment. It kills "bugs" in water. We'll assume this question takes that into account and asks about another halogen.

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15y ago
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13y ago

Chlorine is added to drinking water to kill bacteria, viruses and any other living organisms that find their way into the water system and cause illnesses. It also kills the good bacteria in your body as well if you do not take the necessary measures to remove it from the water.

Roughly 98% of the water that flows through your tap is used elsewhere for industrial purposes and humans consume the other small 2%. Therefore it is regarded as being more economical to use chlorine instead regardless of the health concerns involved.

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14y ago

It depends on the water, how clean and clear it is, and how long it is expected to be in the distribution system. Minimum dose is around 1 ppm, and goes up from there.

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14y ago

Water is chlorinated to kill bacteria.

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13y ago

Chlorine

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Q: Which halogen is added to drinking water to be sure that it is potable?
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