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Re: GFX vs home brew - Page 10

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Posted by Rod Speed on April 19, 2006, 7:25 pm
 
dold@XReXXGFXXv.usenet.us.com wrote

He was clearly pulling your leg.


Basically storage hot water services can end up with
a significant problem if they arent run at a high enough
temperature to kill bacteria, in situations where the
water supply isnt chlorinated like with wells etc.


It does actually. Most obviously with Legionaire's Disease.

And the use of unchlorinated wells with residential
property is much more common in north america too.



Posted by dold on April 19, 2006, 10:37 pm
 


I have lived on well water for many years.  Some people treat water drawn
from shallow wells, but I don't know of anyone that does any treatment to
deep wells.

I find recommendations to raise the temperature to 170f to kill hydrogen
sulfide to get rid of a rotten egg smell, but even those sites say it is
harmless.

Most of the advice is to set the temperature to 140 if you have a
dishwasher, 120 otherwise.

--
---
Clarence A Dold - Hidden Valley (Lake County) CA USA  38.8,-122.5

Posted by Rod Speed on April 19, 2006, 10:53 pm
 dold@XReXXGFXXv.usenet.us.com wrote


Few chlorinate it properly like you see with town water supplys tho.


It is in those small quantitys.


Those that know anything about Legionella dont.
http://www.ihf.ie/news/innsight/98-12inn/page1-4.htm#anchor23477  



Posted by dold on April 19, 2006, 11:44 pm
 

Let's go back to Australia:
http://www.safetyline.wa.gov.au/pagebin/codewswa0210.htm
"Long exposure at 50C or shorter exposure at higher temperatures is
sufficient to kill the bacteria."  That would be 122F.

I remember The American Legion meeting, but that was warm water in a
cooling tower, not a domestic water heater.

"Proliferation of L. pneumophila is promoted by:
a wet warm environment (range 25-42C);
optimum temperature (35-37C);
stagnation or low water turnover;
high microbial concentration including algae, amoebae, slime and other
bacteria;
presence of biofilm, scale, sediment, sludge, corrosion products or organic
matter;
presence of certain materials such as natural rubber fittings which may be
a nutrient source. "

I don't think that describes my domestic water supply.
The recommendation for 120F still stands.  That won't scald, and it will
kill Legionella bacteria.


--
---
Clarence A Dold - Hidden Valley (Lake County) CA USA  38.8,-122.5

Posted by Rod Speed on April 20, 2006, 12:39 am
 dold@XReXXGFXXv.usenet.us.com wrote

No thanks, that specification of the minimum temperature
that storage hot water heaters should be set to is just
about universal right thruout the first world now.

Because Legionella is a real problem with showers.


Thats on the low side of the recommendations,
60C, 140F is much more common.
http://www.google.com.au/search?q=Legionella+60+C


Sure, and after that it was realised that storage
hot water services could be a real problem with
Legionella when they are set a lower temperatures
to avoid scalds with kids and the elderly etc.

Presumably we didnt see that much of problem with
Legionella in storage hot water systems because
most didnt deliberately turn back the setpoint much
before that American Legion meeting made it clear
what a problem that particular bacteria could be.


Thats just cooling towers, different animal
entirely to storage hot water services.


See above.


No it doesnt if you actually have a clue about Legionella


Have fun explaining the common code requirement of 60C, 140F

http://www.dhmh.state.md.us/html/legionella.htm
says you are just plain wrong using rigorous science.



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