i would recommend anyone reading this blog post to do some more research before relying on this method. i don't know the specific micron counts for different protozoa, etc, but i would not use this except as a last ditch survival need. <div><br></div><div>Mutt and i contracted Giardiasis while on the road in texas. we were sick for weeks, and i can guarantee you that the meds alone for the 2 of us, the vet visits, and the special foods trying to keep nourishment in us, cost WAY more than a water filter or bottled water cost. </div><div><br></div><div>"purify" is not the right word to use, unless you can guarantee that all bacteria and viruses can be removed. "filtered" is a better description for the method above. use caution, because water bourne illnesses can kill you.</div><div><br></div><div>nurse kate has spoken. </div>