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Does heating water lower chlorine levels

Posted on 2007-08-06
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I know someone who filters their water, then heats it to lower the chlorine level and improve the taste.  Does heating the water actually drive off chlorine?
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Question by:PaulHews

LVL 44

Accepted Solution

Yes, since chlorine is a gas, dissolved in the water, heating the water will vaporize the chlorine.  However, it will also drive out any dissolved oxygen, making the water taste 'flat' - no taste at all.

Filtering the water should usually be enough to remove the chlorine.

AW
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LVL 31

Assisted Solution

I don't think mechanical filtering will remove chlorine, it'd have to be a chemical filter (ion-changing) and that works for chloride ions. Heating will drive off any gasses, as sugested above, as solubility drops with rising water temperature.
/RID
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LVL 38

Author Comment

>Yes, since chlorine is a gas, dissolved in the water, heating the water will vaporize the chlorine.  However, it will also drive out any dissolved oxygen, making the water taste 'flat' - no taste at all.

That explains the shaking and pouring regimen to "aerate" the water... okay.  :)  So this method really has a scientific basis.

>I don't think mechanical filtering will remove chlorine, it'd have to be a chemical filter (ion-changing)

I wouldn't have thought so either, but references say that activated carbon filters reduce residual chlorine levels by adsorbtion.  Water certainly has less chlorine taste after filtering.
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LVL 31

Expert Comment

Hehe, right, of course... Adsorption would work.. I was thinking along the lines of particle filters, which wouldn't work.
Cheers
/RID
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