A Reid Harvey on fri 25 aug 00
Thanks for your interest, Autumn. I beleive that the folks at Potters
for Peace are telling people the filter buckets last six months to a
year, though my impression is that in many cases tests have indicated
the purifers are still working after this period. And I think that in
some cases a new coating of silver is added, as you have suggested.
As to the lifespan of the filter candles, I do not know. The ones made
up to now have been for various tests only, and some of the last testing
will be for lifetime. In any event, this is one of the reasons I prefer
firing at 'higher temperatures,' which with current purifers has been
^08, and for upcoming ones could be ^04. Though the amount of 'spot
welding' that goes on on a microscale would be far less than for normal
earthenware, due to the very porous structure, it would seem clear that
lifetime would be improved as firing temperature increases. Once we
determine lifetime at higher temperatures we can make the filters at
lower temperatures and test for this again.
Thanks for your interest.
Regards,
Reid
Thank you for your explanation of the filtering system, Reid. The
websites
are very informative.
Is there a lifespan to either the candles or the bucket style filters?
Do
they have to be recoated with colloidal silver after a certain amount of
use?
Good water is becoming a concern in the west too - which may help the
cause
in other parts of the world.
Autumn Downey
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