I'M NO EXPERT! DON'T TRY THIS AT HOME! This vid isn't meant to knock anyone, but rather to caution folks about the potential risks of using makeshift survival water filters and to suggest that any skill or method should first be tested under controlled conditions by a professional. I would suggest getting the water tested at a laboratory before drinking it. Some of the materials used in the making of these survival water filters may introduce toxins or other harmful materials to the water being filtered, rather than filter them out as is suggested.
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