ErnieW
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I want to backpack
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Post by ErnieW on May 20, 2024 13:52:39 GMT -8
I saw this video and thought it was interesting. I did check the MIT paper about the pine branch filter behind it. A lot of info but dry text format.
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geosp
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Post by geosp on May 20, 2024 14:21:31 GMT -8
Interesting! I wonder if the degree of contamination (debris etc) in the source water affects the flow rate and collection amount.
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ErnieW
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Post by ErnieW on May 20, 2024 14:26:24 GMT -8
Another video about it
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ErnieW
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Post by ErnieW on May 20, 2024 14:27:21 GMT -8
The MIT newsletter
From the article “There’s huge variation between plants,” Karnik says. “There could be much better plants out there that are suitable for this process. Ideally, a filter would be a thin slice of wood you could use for a few days, then throw it away and replace at almost no cost. It’s orders of magnitude cheaper than the high-end membranes on the market today.” |
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Post by Coolkat on May 21, 2024 5:24:28 GMT -8
I read about this recently and I thought I had read that that non-flowering trees like pine or cedar are best because they have more of the needed xylem.
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geosp
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Post by geosp on May 21, 2024 14:30:38 GMT -8
Is the reason for 'stripping off the bark' to prevent the possibility of water flowing between it and the sapwood and so not being filtered?
I wonder what the filtration difference would be between that and if the bark was left on (apart from where a branch is whittled to fit the bottle)
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walkswithblackflies
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Post by walkswithblackflies on May 21, 2024 18:01:35 GMT -8
A better test would be to cut two grape vines of equal length. Set up one like the experiment above, and the other leave open-ended at the top. Let all the water drain out of the open-ended grape vine to see how much water was in the vine itself. Let's say it's 8 ounces. Then start collecting the test water from the second vine only after 8 ounces has been "purged".
But in theory... yeah, it should work. I've made primitive filters out of grass, moss, sand, (more moss) and charcoal and was amazed at how well it cleaned the water. This would be a helluva lot easier though, as long as you have the time.
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Image Credit / Coolkat
