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want to share this because it's a very simple way to purify water...

Newly Discovered PRIMITIVE WATER FILTER! 100% Effective(14:37)

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the logic (in my own words as I see it...

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I've got a couple of bottles - similar to this - from ebay and they weren't so expensive (10 years ago) - hope they don't have a 'use by' date - don't think they would - haven't looked at them...