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Old 03-11-13, 06:41 PM   #1
Niles H.
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SODIS -- Scientific Direct Solar Water Purification

This is an interesting alternative to the usual approaches to water purification.

http://www.sodis.ch/index_EN

There are some technical notes available through that site that give additional information and refinements of the technique.

This approach wouldn't be applicable to all touring situations; but for some, it can be very useful. I've been using it and liking it very much.

Last edited by Niles H.; 03-11-13 at 07:30 PM.
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Old 03-11-13, 08:07 PM   #2
TomM
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Interesting concept. Will it work on cloudy days?
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Old 03-12-13, 12:57 PM   #3
Niles H.
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Quote:
Originally Posted by TomM View Post
Interesting concept. Will it work on cloudy days?
Yes, usually. However, depending on how cloudy it is, longer times in the sun might be necessary.

In rainy conditions, it is better (according to the SODIS site) to collect the rainwater.

*******

It should be added that this approach needs to be tweaked (by painting the bottles black on one side, among other measures) to be effective against giardia and certain other organisms.

The simple approaches and rules of thumb given here http://www.sodis.ch/methode/anwendung/index_EN are designed to help people in third world countries by significantly improving their water supplies. However -- and I have to criticize the SODIS site for this -- they do not make it clear that these approaches are not 100% (or even close to 100%) effective against giardia and certain other organisms.

In order to use this technique properly, so that it is closer to 100% effective, you have to do additional research and take additional steps, beyond the simple rules of thumb.

A useful scientific paper that gives additional information and links:

http://onlinelibrary.wiley.com/doi/1...8.04054.x/full

Last edited by Niles H.; 03-12-13 at 01:19 PM.
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