This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
water:start [2020/03/16 15:31] frater_secessus [potable water] |
water:start [2020/03/18 14:25] frater_secessus [disinfecting non-potable water for drinking] |
||
---|---|---|---|
Line 38: | Line 38: | ||
* 212F (boiling at sea level) - 0 minutes | * 212F (boiling at sea level) - 0 minutes | ||
- | * 158F - 10 minutes to kill giardia (only takes 1 minute for everything else) | + | * 158F - 10 minutes to kill giardia (only takes 1 minute for other enteric pathogens) |
* 140F - as long as practical to decrease pathogen load | * 140F - as long as practical to decrease pathogen load | ||
Line 72: | Line 72: | ||
* 1-micron filters will filter protozoa like giardia spores and Cryptosporidium out of clear water.((https:// | * 1-micron filters will filter protozoa like giardia spores and Cryptosporidium out of clear water.((https:// | ||
- | * 0.2-micron filtration can remove heavy metals from clear water.((https:// | ||
* 0.1-micron will filter all waterborne enteric bacteria from clear water | * 0.1-micron will filter all waterborne enteric bacteria from clear water | ||
* Consumer-grade filtration will not remove viruses because of their tiny size. | * Consumer-grade filtration will not remove viruses because of their tiny size. | ||
The CDC points out the difference between nominal and absolute((or " | The CDC points out the difference between nominal and absolute((or " | ||
+ | |||
+ | == fabric filtration == | ||
+ | |||
+ | Note that filtration through layered fabric is much better than nothing. | ||
+ | |||
+ | > 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:// | ||
+ | |||
+ | 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:// | ||
+ | |||
+ | The best we should assume for with such //ad hoc// filtration is a pathogen // | ||
+ | |||
=== SODIS === | === SODIS === |