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I remember those when they were brand new. They were showing emaciated african children slurping up tasty mud puddles. How long do they keep...

I would still be weary of drinking right out of a pond with these; I know it says it'll filter out bacteria and such, but that honestly sounds...

In preparing for the Coof, I snagged a bunch of these. Theyll do the trick, but its no permanent solution.