Ummm No. I've seen you been giving a fair amount of water advice and been completely wrong.
To the OP, don't sweat the chlorine. In the US, the EPA requires your municipality to send you an annual water report. Theres plenty of guidelines. And if you haven't seen one, call them up. Asking strange educated questions to a lab tech\scientist etc. makes their day. Anyways to make a long story boring, don't worry about it.
If you want to learn more about chlorine, and even running sterile hydroponics I made a couple long threads about it.
- Jiji
http://skeptics.stackexchange.com/questions/16842/will-fluoride-and-chlorine-dissipate-from-tap-water-left-to-sit-overnight
OK expert:
"
One common recommendation for watering house plants with tap water is to allow the water to sit overnight before watering, so that the fluorine and chlorine that are commonly added to tap water (which can be harmful to certain plants) will dissipate. I've seen this advice repeated many times, but never an original source or an explanation of the process behind it. So, does this actually work? And if so, how?
Example of claim, for fluoride, found
here:
Tap water is acceptable for watering most plants. Some plants are susceptible to fluoride injury from treated water. Many susceptible plants have long slender leaves such as dracaena and spider plant. Injury is characterized by brown spots along the margin or leaf tip. Fluoridated water should be allowed to sit at room temperature over night before using. Potting soils containing perlite can also cause fluoride injury."
Answer
active oldest votes
up vote 7 down vote accepted
Chlorine does evaporate, so if exposed to air (e.g. in a bucket) in warm water (especially under UV light or sunlight) it will probably mostly dissipate overnight.
Both fluorine and chloramine will not similarly dissipate, if you want them removed you need to filter them out (e.g. with activated carbon) or distill the water.
See
http://chemistry.about.com/b/2013/04/04/can-you-remove-fluoride-by-boiling-water.htm and
http://www.netplaces.com/home-brewing/water-ninety-five-percent-of-your-beer/what-you-must-absolutely-know-about-water.htm"
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It doesn't turn into chloramine, it already has chloramine in it. Otherwise I am right and you are not. If it has to be that way.