This is my final post for today, I've been digging the Inet relentlessly for the whole day!
But this one is a good one- It's possible to sterilize water from bio-infectants, by putting it in plastic bottles in the sun.
Ofcourse plastic bottles are not very healthy after they've been in the sun, it's a known fact. But on the other hand, it's better than no defence against Cholera, which is many times the case.
Just note that the water is probably better disinfected when they're clear, cause otherwise the dirt/algea/whatever blocks the sun UV rays from entering.
Glass is not a solution- as it filters UV rays.
Leaving an open container is probably a possible solution as well, but then it's open for contaminants coming from the outside, and care should be taken for animals etc. not taking a sip or dipping inside.
http://news.bbc.co.uk/2/hi/africa/4786216.stm
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