Best Water Purifiers

I am embarking on a long camping trip in the mountains of South America. Most of the time I will be dependent upon natural water sources for my sustenance.

My question is concerning water filters and purifiers. I recently purchased both for my trip. The Micro Filter claims it removes down to .3 microns. Which I would imagine covers Bacteria, Cysts etc. Leaving the only seeming difference being Viruses?

IF, that is the case I’m not a Biologist, when would you know it was safe to use only the filter, and when to use the purifier? AND, if the purifier is the only thing 99.999% able to provide me with unquestionable drinking water. Why would ANYONE want or use a Microfilter?…

Thanks In Advance To All Who Responded!

Hi, thanks for everyone’s help with earlier questions. I understand the difference between water purifiers and filters/microfilters. Again, I am nervous about using a Pocket Katadyn or PUR/Katadyn Hiker filter. Again, I am only using this in clean Canadian national park quality lakes, with the exception of one or two fishing lakes where I have seen the occasional boat motor (less than 50 a year). There is a bit of salt runoff from the highways nearby I would imagine, but trace amounts in lakes usually 1-2 miles long with no cottages on them.

Should I worry about ‘beaver fever’, or any kind of bacteria using these filters in fairly clear water? I swim in these waters all the time, and have never got a rash or ear infection nor has anyone else who’s gone out camping with me. Am I being nuts?

Also, if you DO suggest a purifier, can you recommend one that is easy to use (i.e long life / cleanable filter components…years between filter changes, etc)…and what is a good value model?
Schnurrbart I’m hoping you see this!