big brown horse
Hoof In Mouth
I just read about this in National Geographic and had to share. Basically you can disinfect water, say from a stream or lake, by filling up clean, labeless PET plastic water bottles and putting them on a shiny-ish metal surface (like a tin roof) for 6 hours in direct sunlight*.
Here is the link: http://blogs.ngm.com/blog_central/2010/04/high-marks-for-clean-water.html
another on the subject: http://www.sodis.ch/methode/anwendung/index_EN
and another:
http://en.wikipedia.org/wiki/Solar_water_disinfection
PET water bottle info: http://en.wikipedia.org/wiki/Polyethylene_terephthalate
*must be in the direct sun for 6+ hours to work.
Here is the link: http://blogs.ngm.com/blog_central/2010/04/high-marks-for-clean-water.html
another on the subject: http://www.sodis.ch/methode/anwendung/index_EN
and another:
http://en.wikipedia.org/wiki/Solar_water_disinfection
PET water bottle info: http://en.wikipedia.org/wiki/Polyethylene_terephthalate
*must be in the direct sun for 6+ hours to work.