Sapwood acts as Water Filter

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Thread: Sapwood acts as Water Filter

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    Sapwood acts as Water Filter

    Check this out. This could be good to know. Its simple and effective.

    Sapwood Acts as Water Filter


    If you can cut a tree limb you can use it for a water filter. Knowing this might keep you from getting sick.
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    Works well, but very slowly.
    In hot climates, tree roots pull moisture from the ground up into the branches.
    After sundown, as the temperatures cool, you can cut a branch and catch water (slowly),
    as the tree releases the moisture from the limbs back into the root system.

    Takes quite awhile though.
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    Well, that's better than a sharp stick.
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    In Florida we just dig a hole in the ground!
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    That's a pretty cool trick. Cliff note version:
    wood water filter.jpg
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    Cliff notes, on the method:

    In fact, an MIT team has discovered that this low-tech filtration system can produce up to four liters of drinking water a day — enough to quench the thirst of a typical person.

    This experiment showed that sapwood is naturally able to filter out particles bigger than about 70 nanometers.

    ... was able to filter out more than 99 percent of E. coli from water.


    I wonder how many limbs would be required for that 4L/day volume they describe. I mean, could a person simply cut 3-4 limbs and easily be able to keep a couple people well-watered all day?

    Useful trick to know, either way. A liter here, a liter there ... and pretty soon you're talking about survival. Assuming there are such "dripping" trees around.
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    One of the greatest benefits of our Georgia property is plenty of firewood and two natural springs.
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    Quote Originally Posted by molleur View Post
    Works well, but very slowly.
    In hot climates, tree roots pull moisture from the ground up into the branches.
    After sundown, as the temperatures cool, you can cut a branch and catch water (slowly),
    as the tree releases the moisture from the limbs back into the root system.

    Takes quite awhile though.
    Seems like it would be like watching paint dry. If you had a spare piece of plastic sheeting you could setup a *catcher* to contain the water. While you're off somewhere working on your shelter or checking your snares your water catchment system
    would be *working* to make some coffee water later in the day.
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