Interesting Stuff

Sunlight Equals Potable Water! Infographic

Here’s my second attempt at an infographic, this time about using SODIS. Enjoy!…


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By Damian Brindle

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12 replies on “Sunlight Equals Potable Water! Infographic”

My question is regarding ” few drops of bleach vs a few drops of iodine ?” Which would be more effective and safe?

I would use bleach as my first water treatment option but be sure you get the dosage right as it is possible to both use too little as well as too much AND there is a “more concentrated” bleach out there now. Use this post as a guideline:

As for iodine, it’s not used as much for water purification these days so I wouldn’t bother with it but I have used Polar Pure in the past; If you’re interested here’s a link to buy on Amazon:

Good infographic. The SODIS site had a brief comment about filtration (debris, turbidity), but my German’s not good enough (and Bing Translator’s German isn’t either *heh*) to dig around finding suggestions on that process, so. . .

I took caps from two 2-liter bottles and glued/taped them together back-to-back.

Drilled a 3/8″ hole through the tops.

Cut a funnel from the top of a 2-liter bottle.

Attached the doubled caps to the funnel.

Now, with the addition of either a coffee filter or some other filtration material (fine cloth, etc.), I can filter water for each 2-liter purification bottle by attaching this filter to the lip of the receiving bottle. Yes, it does filter slowly, especially since there’s no relief and it must “glurggle” a bit at a time into the receiving bottle. I just view it as pre-aeration. 🙂

Thanks for the great infographic. Kudos, applause, hurrahs and etc. 🙂 I probably ought to make a mini-graph of my own for the filter.

It will NOT work with some plastic bottles or with any glass bottles. UV rays from the Sun kill the bacteria, but UV rays don’t penetrate glass. Also, the water has to be quite clear.

It does kill a few pathogens that bleach doesn’t effectively kill.

According to the information at the SODIS site, not all glass is created equal (as we all know), and of the glass bottle types that do transmit UV rays, they do so at a greater rate than clear, transparent PET bottles (as do PE plastic bags). The selection of PET bottles for water purification at the SODIS site is not based on best UV transmission, but on optimal use (durability, weight, availability, good–but not best–UV transmission, etc.)

The only problem I have with this is it is difficult to know that the pathogens really are neutralized. Using a couple of drops of bleach per gallon or a water purification tablet is so much more certain. I know this is something to be done when you have no other choice, but man, it sure seems risky.

I don’t see why it wouldn’t work as the only concerns would be breakage and the possibility for leaks from the lid. Soda bottles are usually the most durable, leak-resistant option.

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