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Chloramine is not chlorine (was Re: [Killietalk] Drip emiters vs. valves)
Sorry if I sound like a cracked record, here, but we do *not* have
chlorine in our water, in the vast bulk of the US!
George & Melanie wrote:
I am sure water quality varies per local,
Not as much as it used to, before EPA mandated that some ammonium be
added to the chlorine to form the more-stable chloramine in almost all
community water supplies. It's a simple, cheap change that reduces
cancer. [Unfortunately it has other effects on fish.]
but when you are talking of a
partial water change I am not sure how critiacal it is to have 100
percent of the chlorine removed.
IMHO, it is far more important to have no *chloramine*, as it has proven
to cause severe reproductive problems in killifish at sub-lethal dose
levels. [IDK that chlorine ever did that.]
If you live in a area that has such a
high concentration of chlorine in your water mild aeration may help in
the chlorine removal.
Most unlikely, any more, George. Test, before and after. If the chlorine
reading was reduced, you don't have chloramine. If not, you do. You need
to run this test every single time, because EPA compliance is sometimes
spotty, and local districts are notorious for not warning customers when
they change over to chloramine (i.e., start to add a little bit of
In all cases common sense prevails.
My point, exactly.
Wright Huntley wrote:
George & Melanie wrote:
Sounds like you need a water storage drum in your garage. You could
fill that drum from your outside hose. Then let the water sit for a
day or two. This will let the chlorine disapate ...
There is almost no place left in this country, where the chlorine will
dissipate in a "day or two." The typical half-life, now that they have
learned to add a bit of ammonium is much more like 5 weeks.
I don't mean to disparage your advice, but I feel it is dangerous to
let anyone think we are still living in the era when chlorine (not
chloramine) was the disinfectant of choice. Once they found that it
caused carcinogenic compounds, there has been a strong campaign by EPA
to convert *every* municipal water source to chloramine. It won't
dissipate, and using hypo or other old-fashioned dechlor products will
produce a deadly burst of ammonium/ammonia. If pH is above about 7.5
(also EPA mandated), look out!
You have to live in a mighty rural area to still have chlorine as the
primary disinfectant. In my situation I have none, but one or two
wells in the Bishop area still test high enough for bacteria that they
do use it. [I'll be surprised if they get through this year without
adding enough ammonium to form chloramine, tho.]
The best is to be aware and to test and read your water reports. The
big problem is that lethal levels of ammonia are way below the minimum
reading of the test kits we can afford. If in doubt, it is safest to
assume that chloramine is present, and act accordingly.
Wright Huntley -- 760 872-3995 -- Rt. 001 Box K36, Bishop CA 93514
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