[at-l] RE: [BackpackingLight] Potable Aqua vs Water Purifier

["Beau Bushor" <mail2beau@adelphia.net>]

Daphne,

Very interesting message.  I have wondered the time difference between the
two and now you have answered it.  Thank you.

Take care,

Beau Bsuhor N1MJD
   "bleeder guy"

Coming events:
There will be loads of backpacking activities including slide shows,
presentations, equipment reviews, and lots of just plain fun.

**ALDHA - East "Gathering 99", October 8, 9, 10, 11 (Columbus Day weekend)
in
   Hanover, NH, http://www.aldha.org
**ALDHA - West "Gathering 99", October 1 - 3, At the Mazama Lodge Mt Hood,
OR.
    http://www.gorp.com/nonprofit/aldhaw/



-----Original Message-----
From:	Daphne Dionisio [mailto:daphne_paige@geocities.com]
Sent:	Monday, June 21, 1999 10:29 PM
To:	BackpackingLight@onelist.com
Subject:	[BackpackingLight] Potable Aqua Vs Water Purifier

From: Daphne Dionisio <daphne_paige@geocities.com>

Hi all,

    A while back someone had asked why water purifiers pumped water free
of viruses after only a few seconds exposure to iodine in the purifier
when iodine tablets  & Potable Aqua tablets required at least 20 minutes
wait time.  I found out the answer today.  Apparently there is a scale
of iodine strength: I-1 through I-9 (where I-1 is very weak strength and
I-9 is strongest).  The amount of exposure time it takes to kill viruses
depends upon the strength of the iodine.   The idodine contained in
Potable Aqua tablets actually rank at .5 (that's half the speed/strength
of I-1).  Pur and Sweetwater brand purifiers use I-5 iodine and
therefore kill viruses much, much faster.  Both Pur and Sweetwater meet
EPA criteria for purifiers.  However,  the Sweetwater Guardian Plus
purifier has a pump design that exposes the water to the iodine element
for 6 seconds during the process of 1 pump stroke.  This is sufficient
to kill viruses.  The Pur purifier pump/water chamber is designed in
such a way that in order to kill viruses, you must restrict each pump
stroke so that it takes 10 seconds per stroke.

And if the water appears to be most foul, you are supposed to pass the
water thru the filter twice over.


~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~
Daphne
Email: daphne_paige@geocities.com
Check out my Make Your Own Outdoor Gear website at:
http://friends.backcountry.net/daphne
~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~   ~



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