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How does a plastic bag filled with water act as a fly repellent?
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42 Posts
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July 17, 2012 - 8:44 am
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I've camped with others that swear by this solution for flies bothering you.

Take a ziplock sandwich bag, fill it 1/2 way with water, add 4-6 pennies. Zip it closed and place near problem area.  I've heard some pin them up and maybe a creative attachment solution for the camper.

Information I've read online.

The water bags do drive houseflies away. Houseflies, being highly defenseless, are nervous types and don't like to sit still when they see something moving nearby, because it could be a predator. The water bag acts like a lens in which the movements of people in the area are reflected. Even if the fly is too far from the action to see it directly, it can see a shifting of light and dark in the water bag, which it interprets as nearby movement, and it will fly away from the bag. The reason it doesn't work on any other insects is that the other insects don't have as highly developed ocular senses. I have used this bag o' water trick in two different locations which were inundated with flies and can testify that it does work, and there is scientific reasoning that can be used to collaborate. The walnut in the pocket argument is highly specious with no grounds at all, and a very poor example to use in conjunction with the water bag.

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1238 Posts
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July 17, 2012 - 10:13 am
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I don't know the how it works but it's a very common sight in the rural south.

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91 Posts
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July 17, 2012 - 11:09 am
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I never heard of the need for pennies.

Walnut in a pocket?  :-X

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600 Posts
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July 17, 2012 - 12:48 pm
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there is an older woman at the flea market who makes abd sells her own version. she named it
FLY BE GONE, and sells then for $5.

( no packaging or marketing strategy) and she sells a lot of them!

it is a little glass globe, in a decorative basket/bracket, and hangs from most valance/curtain rods.
( or even an eye hook)

fill halfway with water, and add 2 pennies.

they look pretty, and no one notices them as unsightly or odd.

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77 Posts
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July 17, 2012 - 7:56 pm
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One bag half full, one penny. Even if it doesn't work makes for a good conversation starter...

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517 Posts
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July 17, 2012 - 8:06 pm
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I heard its cause fly eyes are made like diamonds and the water/pennies are magnified so much that they fly away scared? 8)

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5 Posts
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July 17, 2012 - 11:05 pm
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It does effect flies vision, confuses them and they avoid the area. Of course not sure how the figured this out.

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