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--- water:start [2020/03/16 15:31]
frater_secessus [potable water]
+++ water:start [2020/03/18 14:22]
frater_secessus [disinfecting non-potable water for drinking]
@@ Line 77: / Line 77: @@
 The CDC points out the difference between nominal and absolute((or "mean")) micron ratings:  "The absolute 1 micron filter will more consistently remove Cryptosporidium than a nominal filter."((https://www.cdc.gov/parasites/crypto/gen_info/filters.html))
+== fabric filtration ==
+Note that filtration through layered fabric is much better than nothing.  In India, for example, researchers found:
+> a filter made of four layers of worn cotton material held back more than 99 percent of all cholera bacteria - using more layers or newer cloth slowed water collection too much.((https://www.fic.nih.gov/News/GlobalHealthMatters/january-february-2015/Pages/nursing-cholera-sari-water-filter.aspx))
+Both saris and coffee filters have about a 20-micron pore size:
+> Typically coffee filters are made up of filaments approximately 20 micrometres wide, which allow particles through that are less than approximately 10 to 15 micrometres((https://en.wikipedia.org/wiki/Coffee_filter))
+The best we should assume for with such //ad hoc// filtration is a pathogen //reduction//.  Combination with SODIS (below) might be useful.
 === SODIS ===

RV and vandwellers wiki