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How is stagnant storage thermal storage water preserved?

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Posted by Solar Flare on November 27, 2005, 7:49 pm
If one uses a large inground storage tank full of water
and insulated for thermal storage, how would I preserve
the water to stop fermentation and/bacteria growing in

Would common chlorine or bleach do the job? Would i
need to drain and refill it once a year or every couple
of years maybe?

Posted by samc on November 27, 2005, 9:59 pm
  Solar Flare wrote:

a good ? I have been thinking about the same problem all I know is water
should be kept at below 20 deg c or above 60 deg c and there are
additives for primary circits in boilers/solar colectors .

Posted by Steve Shantz on November 28, 2005, 1:20 am
  Solar  Flare wrote:

Are you using this water directly for DHW, or passing it through a heat
exchanger?  If the water is not for DHW, I think bleach would do a good
job.  You might want to check for chemical incompatabilities with
bleach though before you start bleaching.  Draining and refilling
likely wouldn't do much good, because you will likely have a bio-film
on the surface of everything that will instantly re-contaminate your
fresh water.

If you can get the water up to 65 C once in a while, and keep it there
for several weeks or longer, this should also be effective.

Best regards,


Posted by John on November 28, 2005, 4:10 am
 I saw a UV hot tub "filter" at an organic home and garden show a while
back.  (Have also seen them for A/C units...)   I wonder if that could
be modified to work.  It would be a little more trouble than chemicals,
but it shouldn't corrode your pipes.


 Solar Flare wrote:

Posted by Steve Shantz on November 28, 2005, 4:57 am
 We have a 1500 L tank of RO water where I work, and we circulate it in
a loop around the building.  We put in a UV light to control microbial
growth, and it didn't do anything.  Such a light might work if your
system was sterile to begin with, but it won't have near the intensity
inside a tank to be effective.  Bleaching 2x a week was the most
effective remedy to the growth. (We tried all sorts of other exotic


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