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Okay this is bizarre but it works. Apparently if you fill a ziplock bag half full with water, put a few pennies in it, and hang it in a doorway where flies are abundant, it will repel the flies. I guess the logic to it is that the pennies combined with light make the water molecules reflect a zillion different colors of the light prism. Since flies see through hundreds of eyes, it creates an overload for them and they stay away. Try it, it's free.
 

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I've seen it before. It helps, but it's not 100%. However, since it's virtually free, it sure can't hurt!
 

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at work, we keep the door open since it hasnt been a hot summer and we get flies in.

I put 2 pennies in a water bottle and its not helping much :(
 

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Fly solutions

I've heard the same, but without the pennies. The explanation I received is that the flies see their relection in the water, enlarged, and are scared away. Not sure if I believe it.

I don't know any free solutions that work, but this list of other solutions might be of interest: Best 10 Solutions for Horse Flies

Actually, I haven't even had a lot of luck with the solutions I've tried. Bought fly collars for my horses --- useless. Tried natural fly repellant (garlic) --- useless and the horse stank. Currently rely mainly on fly sheets and fly hood, plus occassional fly spray (I've found Endure lasts the longest, but after moving to France can't use it as it is illegal here since they consider horses meat animals and the chemicals are too strong to use on meat animals).
 
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