Solar Water Disinfection (SODIS)

Via Afrigadget, a visual explanation of how to disinfect water with just a PET plastic bottle. The diagram, developed by Unicef, pretty much speaks for itself. Too much gunk in the water? Let it settle and filter through some cloth. At least six hours of sunlight will be enough UV to kill bad buggies. Using solar water disinfection, or “SODIS”, replaces the need to boil water, thus reducing deforestation to supply fire wood.

Obviously, this is not a long term solution. Drinking water out of heated plastic bottles can’t be a good thing. But in a pinch . . .

More info here.

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  1. I suppose when it is the difference between not having anything to drink and having some, I’d take the plastic bottle!

    Does this work for those big glass jars I have, I wonder?

  2. From the site:
    “Glass: Also glass bottles can be used for SODIS. But it is not possible to construct shallow, large containers using ordinary window glass, as window glass does not transmit UV-radiation adequately.”

  3. Maybe a Mason/Kerr/Ball jar? How does one know what glass filters UV and what doesn’t?

    This could come in handy. Thanks for posting!

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