From the Sawyer website FAQs regarding their purification systems.
Sawyer’s filters and purifiers are rated in Absolute Microns. This means there is no pore size larger than 0.1 or 0.02 micron in size on the PointONE™ and PointZEROTWO™ respectively. This means that it is impossible for harmful bacteria, protozoa, or cysts like E. coli, Giradia, Vibrio cholerae and Salmonella typhi (which cause Cholera and Typhoid) to pass through the Sawyer filters and purifiers. At 7 log (99.99999%) the filter attains the highest level of filtration available today. The PointZEROTWO™ filter removes both bacteria and viruses.
Sawyer PointONE™ Filtration
The PointONE™ filtration system is usually all you would need unless you are traveling internationally (developing countries) where waterborne viruses such as hepatitis and/or Polio are present. This system removes all harmful pathogens from your water.
Sawyer PointZEROTWO™ Purifier
If viruses are an issue, we offer the PointZeroTWO™ Purifier (0.02 micron absolute pores), the first and thus far only portable purification device to physically remove viruses which it does at a >5.5 log (99.9997%) rate, exceeding EPA and NSF recommendations. Due to the significantly higher level of filtration, PointZEROTWO’s flow rate is considerably slower than the PointONE™ filters.
North America vs. Third World Countries
In North America we do not have concerns about viruses in our water. They simply cannot survive. Viruses derive from contaminated human sewage and die shortly after entering a body of water. In Third World countries outbreaks have occurred due to poor treatment of sewage. Sewage without viruses can be handled by the PointONE™ filter. The only viruses with the potential to survive in water are hepatitis (which is rare) and Polio (which is extremely rare). You can contact CDC for information on virus outbreaks in areas for which you are traveling.
This text taken from the Sawyer website
https://sawyer.com/sawyer-u/faqs/
Water Treatment &
Purification
December 22, 2015 Show
For your edification: Compare the Berkey Purification Element data (only used in the one purification system the rest are just filters) against the data presented by Sawyer on their purification systems.
I gave Berkey (New Millenium Concepts, Ltd.) an opportunity to explain. The feeling that I was left with was that they thought I was not smart enough to understand. My answer is try me. I gave them the benefit of the doubt that they were capable, if you read the, "what is the Micron rating" page on their website below, that is basically what they say; paraphrasing: it is too complicated for you to understand so I will not tell you.
You read and decide for yourself. Also remember the only one that they claim in writing, removes the bacteria and viruses, is the Purification Element.
Although chemical treatment of water is the primary means of rendering raw water "safe for human consumption" it is not all that it is cracked up to be.
If you read the pages associated to the button below you will learn about the shortcomings of chemical treatment. The purpose is not to doom and gloom, but to make you aware so that you will prepare with more reliable alternatives.
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