Mar 30, 2013 · The Sawyer bottle has a 0.1 micron filter size, which is good for everything biological except viruses, and it won’t handle chemicals, either, so it’s no good for low-quality tap water; but it’ll handle 99.99999% of bacteria, along with other bacterially-sized microorganisms (cysts, protozoa, etc), which works just fine for filling up ...
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