I would suggest trying to find some other pipe than PVC- that stuff is
not good for you, and can cause cancer. Polyethylene is pretty inert as
far as plastic goes, but am not sure they make pipes out of it.
Activated alumina is used as a mechanical filter much the same way as
charcoal, and maybe zeolites. See Wikipedia:
"Activated alumina is manufactured from aluminium hydroxide by
dehydroxylating it in a way that produces a highly porous material;
this material can have a surface area significantly over 200 square
metres/g. The compound is used as a desiccant (to keep things dry by
absorbing water from the air) and as a filter of fluoride, arsenic and
selenium in drinking water. It is made of aluminium oxide (alumina;
Al2O3), the same chemical substance as sapphire and rubies (but without
the impurities that give those gems their color). It has a very high
surface-area-to-weight ratio. That means it has a lot of very small
pores, almost like tunnels, that run throughout it."
Alum is a different animal.
I used to hail from So Cal- my town was floridated years ago.
Kathryn
On Nov 17, 2007, at 7:21 PM, <gvagraph...@adelphia.net> wrote:
Ode,
What filtering medium can you suggest for filtering fluoride. I'm in
sourthern CA and they are starting to fluoridate our water supply. My
concern is bathing and showering -- drinking water is an easier matter
to deal with.
Some time ago someone suggested Diatomacious earth as a likely filter
medium (not for filtering fluoride).
The net suggests Activated Alumina -- not to sure about using Alumina
to filter water for showering -- then again something call Alum is
used in the water treatment area and has been for many years -- is
there a connection?
There are small filters available for shower heads -- I can't see them
doing much for long. Our water has a TDS reading of 400 not exactly
for making CS. Not sure what the PWT reading is!
I'd like to cobble together a pre-filter array of say 4 x 48 inch (4"
black PVC pipes) filled with a fine granular filtering medium -- a
final finer filter into the hot and cold water pipes -- a commercial
system will cost 5-600 bucks (a maybe 24 inch metal cylinder and you
don't know what they are using as filter medium!!! Obviously I'd be
perpared to maintain the unit closely and renew the medium -- being
well armed with a TDS and PWT meter!
Of course I have to wonder if my array of 4 x 48 inch pipes will take
the pressure of an incoming town water system -- that I can research
myself! I use Albertsons distilled water for my Bob Berger
constructed CS-EIS Maker.
Any suggestions Listers -- Thanks
Douglas Haack
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