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To the best of my knowledge most tap water contains chlorine, which is added at a water treatment plant in order to kill bacteria and other unhealthy organisms. If you allow tap water to sit for an extended period of time (dependent on amount of water..approx. 1-2 days per gallon), the chlorine will actually evaporate. While having the chlorine in tap water for the purpose of killing of contaminants is good, I think once it is out of the tap it is better to let it evaporate. After all, chlorine is a poison appropriately to kill living things.

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12y ago
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Q: Does tap water naturally become better drinking water after it sits for a period of time?
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