[at-l] another water purifier

[David Addleton]

do you know of any way to generate ozone with some uv in a small, light
package?

On 10/10/06, Logan Park <park at vt.edu> wrote:
>
> Bleach (sodium hypochlorite) and Aqua Mira (chlorine dioxide) both use
> variations on the chlorine theme.  Bleach works because it is strong
> stuff used in relatively high concentrations.  Aqua Mira works because
> chlorine dioxide is actually a gas (in our application, dissolved in
> water much in ht e same way a coke is carbonated), so it is pretty good
> at getting past the chemically resistant cyst outer layers.
>
> The EPA has not to my knowledge released standard testing data on AM,
> but this US army evaluation notes that AM will reduce Giardia counts by
> a 3-log factor (a factor of 1000 IIRC).  See
>
> http://usachppm.apgea.army.mil/WPD/WPDSHARE/143/AddInfo_McNettAquaMira.pdf#search=%22Aqua%20Mira%20McNett%20giardia%22
> Sorry for the long URL!
>
> In the following EPA report,
> http://www.epa.gov/ogwdw000/mdbp/pdf/alter/chapt_4.pdf
> page 15 et seq. describe chlorine dioxide as more effective than
> bleach.  It is a great read if you have a healthy sense of humor
> (chlorine dioxie is highly explosive, which is why we generate it onsite
> when hiking).
>
> So, short story long, Aqua Mira does in fact kill giardia, and better
> than does bleach.  Neither is particularly good against
> cryptosporidium.  YMMV.
>
> Hoplite
>
>
> Point North wrote:
> > Aqua Mira doesn't kill giardia, does it?
> >
> > What about bleach?
> >
> > Logan Park <park at vt.edu> wrote: David Addleton wrote:
> >
> >>
> http://www.nytimes.com/2006/10/10/science/10find.html?_r=1&ref=science&oref=slogin
> >>
> >> I imagine it will need only a tweak or two to make it useful against
> giardia
> >>
> >>
> >>
> > Yus-- sadly the cyst is 1-6 microns (the filter is 6).  The tradeoff for
> > a more effective filter is, of course, that it catches more and
> > consequently would get surface saturated more rapidly.  For the water
> > quality research I did in college, we'd use 0.6 micron filters, and
> > they'd clog after ~2 L filtered under 2-3 atm of nitrogen pressure.
> > Aqua Mira for me.
> >
> > HopThirsty
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