I just came across this link, looks like poor hygiene is the main cause of giardiasis.
http://lomaprieta.sierraclub.org/pcs/articles/giardia.asp
I use a inline/gravity filtration system, it looks like a little plastic fuel filter and only weighs 2oz. The brand I have is Safewater Anywhere which is out of biz.
A comparable, slightly better product can be seen at:
http://www.seychelle.com/index.htm
The easiest way to use this filter is to hang a Platypus with/hose kit, connected to another hose/bag with the filter in-between. Gravity will do all the work.
It can also be put inline in your Camelback drinking hose.
Rewiews can be seen at:
http://tinyurl.com/vltv
Our 708O2 crew of eight took four of these, each tent buddies had one to share. this worked very well for us. We took one bottle of Iodine to make our ranger happy, but he really didn't care.
Another option is AquaMira chemical treament. Arewiew can be seen at:
Below is an excert from the review.
AquaMira Water Treatment is a liquid water treatment that kills bacteria and improves the taste of water from treated or untreated sources. Unlike iodine-based treatments, such as Potable Aqua, AquaMira is marketed as having no "unpleasant taste or odor". AquaMira comes packaged as two separate 1oz. bottles and requires pre-mixing before adding to water. Part A is a 1oz bottle of Chlorine Dioxide (which contains no chlorine, by the way) and Part B is a 1oz bottle of Phosphoric acid "activator". The chemical reaction of the chlorine dioxide (Part A) and phosphoric acid (Part B) in AquaMira causes the water to oxygenate, which kills the baddies. AquaMira states this package will treat 120 liters (30 gals) of water A clear plastic box with a lid keeps the bottles and instructions together in one place.
YIS
Jimmie White
Troop 142
Fayetteville AR
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