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RE: Surthrival Trailer Mark 1 Update 38 Creating a Biosand Pre-Filter for Water Purification

Yes, very cool filter system... Don't drink unless last resort!!!! I love it. It's true that folks could take the greatness of this filter as well he said it was betyer as it ages.
Thanks for the lesson, I don't think I knew about this one, at least not in details.

Bookmarking this one for a future project and re-steemin!!!