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Old 5 August 2017, 11:30
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Water Purification - SODIS method

So you're grid-down, no filtration available, and water is available but you suspect it's loaded with viruses and bacteria. What to do?

Try the SODIS method.

Put your water into CLEAR plastic bottles that are made of PET. This can be identified by the triangular recycle symbol on the bottom with a '1' in it. Green or other colors won't do... it must be clear.

Lay the bottles in the sun, preferably on a sheet of corrugated metal, if available, for at least six hours. The ultraviolet light in the sunlight will kill all the nasties that are cruising around in the water in six or so hours.

Looks to me like this method is pretty reliable, low-impact, and can go a long way toward keeping you healthy when you're in GrubbyTimes.
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Old 5 August 2017, 21:53
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Quote:
Originally Posted by B 2/75 View Post
So you're grid-down, no filtration available, and water is available but you suspect it's loaded with viruses and bacteria. What to do?

Try the SODIS method.

Put your water into CLEAR plastic bottles that are made of PET. This can be identified by the triangular recycle symbol on the bottom with a '1' in it. Green or other colors won't do... it must be clear.

Lay the bottles in the sun, preferably on a sheet of corrugated metal, if available, for at least six hours. The ultraviolet light in the sunlight will kill all the nasties that are cruising around in the water in six or so hours.

Looks to me like this method is pretty reliable, low-impact, and can go a long way toward keeping you healthy when you're in GrubbyTimes.
Ahhhhhhhhhh...... Grubby times indeed!
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Old 5 August 2017, 22:44
DaveP DaveP is offline
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Always thought of chlorine as an end-default method, esp for larger volumes if/when needed, but it's not a pleasant taste even when the treated water is used for rehydration of dried foods, etc; and from the linked manual ver. 1, it apparently doesn't eliminate Giardia, crypto, or some ova - didn't know that.

Some specifics from the tech section (2) of the manual include inverse efficacy with turbidity (allowing settling or gross filters pre-'cook' would be helpful); ambient temp and degree of cloud cover dictate duration required even with reflector use (pasteurization-dependent); and pre-shaking increases available O2 for free-rad and peroxide formation, but mixing during sunlight exposure not advised.
The socio-economics parts of the lit were pretty interesting, too. Time-, resource-, labor-savings in third-world settings. For survival or E and E, avoiding production of smoke, smell, residue from a fire would be a bonus.

Cool link. Thanks.
DaveP
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Old 12 August 2017, 06:01
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I haven't seen that on Dual Survival. Ha. Good to know though.
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Old 12 August 2017, 14:57
maim maim is offline
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Used it in Mali, taught the locals about it, appears to work well.
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Old 14 August 2017, 04:51
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Thanks for the great info!
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