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RE: Water Purification

> I was thinking about using tincture of iodine that's in my first aid
> kit as an emergency backup for water purification

Time for this again...

Check out http://io.datasys.swri.edu/wisdom/Panel_09_Water.html
for a detailed discussion on backcountry water treatment.  You
need to read the complete document.

Here's a relevant piece of the quoted document; consider it
the 'warning label':

As observed by Jarroll, et al (5), the 2 percent tincture of
iodine was less effective than the other iodine preparations
with 30 minutes of contact time...