Another point for filter is see what size it filters down to. If you are out side of US (with more nasty bugs in the water) you may need a more extensive or redundant system.

for example the MSR Mini-Works is .2 microns

just found this, very insightful.
http://www.katadyn.com/usen/water-knowledge/water-contamination/

Last edited by james_bond; 06/24/10 05:42 PM.
JYD #25 Clinging to my Guns, Religion, and Scrapyards.