This video is Part 4 in a series on Backcountry Water Treatment methods, focusing on Ultrafiltration purifiers, also known as the removal of viruses (in addition to bacteria and cysts) from drinking water by size-exclusion.
It addresses the claim that viruses are too small to be filtered by hollow-fiber membranes with 0.02-micron ratings, looks at filter options available in this class, and discusses the viral risks in backcountry waters.
There are also sections on the health threat of flood waters in a disaster, and the tactic of filtering your water twice for the additional removal of pathogens.
Watch the entire Backcountry Water Treatment series here:
Index
00:21 Is Virus Filtration a Myth?
16:22 Section Summary
17:00 Virus Filters
22:42 Viral Risk Factors
32:42 Filtering the Risk
35:23 Section Summary
36:27 Water Treatment During Disasters
38:15 Tactic of Filtering Twice
41:22 Runt Microbe Theory
43:02 Rogue Pore Theory
50:03 Conclusion
