[Greenbuilding] Legionnaire's in water wall features
RT
archilogic at yahoo.ca
Thu Jan 12 10:09:40 CST 2012
On Thu, 12 Jan 2012 05:48:47 -0500, John Daglish <johndaglish at free.fr>
wrote:
> just to repeat ultrafiltration or ultrasound/UV can reduce the risk
> considerably... ultrafiltration at < 5 microns
> is smaller than the legionella bugs
Oy! Qu'est-ce qui se passe, mon ami John?
Perhaps this helps to explain why I`m still alive and feel the complacency
that I do WRT legionella exposure (as I speculated the last time this
subject surfaced a few months ago
http://lists.bioenergylists.org/pipermail/greenbuilding_lists.bioenergylists.org/2011-August/002200.html
`Perhaps long-term, daily exposure to low doses of Legionella in the
course
of our daily washing activities has helped a large portion of that 25% of
the population who apparently have contaminated HWHs, to develop a degree
of immunity to that bacteria ?` )
I have an inexpensive whole house in-line filter on the supply line after
the pressure tank, the intention being to filter out the sediment and
particulates in our very hard water that is drawn from a well drilled
through 18 metres of a pocket of Nepean-March Formation sandstone which
sits in a depression of the granite of the Canadian Shield.
The filter supposedly is effective down to 5 microns. On second thought
though, that filter being on the inlet side of the DHWH wouldn`t do
anything WRT removing legionella bred in the DHWH and fed into the HW
supply lines.
Nor does it help to explain why the sun-warmed rainwater in the
rainbarrels from which I draw water to shower every morning after bike
rides, hasn`t killed me. It would seem that the well-below 60 degC
conditions inside a sun-warmed rain barrel (with no filtration of roof
runoff ) would create ideal conditions for harbouring legionella (not to
mention West Nile virus-transmitting mosquitoes) etc.
And yet, I`m still here, alive and well. Most puzzling. Eh?
--
=== * ===
Rob Tom
Kanata, Ontario, Canada
< A r c h i L o g i c at Y a h o o dot c a >
(manually winnow the chaff from my edress if you hit "reply")
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