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Do Ziplock Bags With Water and Coins Really Repel Flies?

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I have been told by one of my friends in USA that to prevent flies from being an area you just half fill a Ziplock bag with water and put some pennies in it seal it up and hang it were flies get into the house. Does this work? And also we don't actually have pennies here so would any other coin still work?

By Sharron from South Australia

Recent Answers

Here are the recent answer to this question.

By KS Granny [3]01/20/2011

I just checked out the link, "Repel Houseflies with Bags of Water" (
One of the replies suggested using one of those ?-shaped travel clothespins, so you can hang it on the door knob or wherever. Sounds good to me! I'd clip it below the zipper to keep it from sliding out of the clip.

RE: Do Ziplock Bags With Water and Coins Really Repel Flies?

By KS Granny [3]01/20/2011

Sarsi, I've been watching for a response to this question, but haven't seen one. I'm guessing either you hang it with a bulldog or binder clip (two types of spring-loaded paper clamps), or you run a needle & heavy thread through a couple of places just above the zipper, or, since you're only filling it half full, maybe you could run the needle and thread just below the zipper. Someone who's done it, please post. How did you do it?

By Zippy [2]01/19/2011

If you don't have pennies, just a little piece of or anything copper, perhaps a bracelet or chain?

By shoe [2]01/17/2011

Now this may be obvious to everyone but me, but how do you hang up a ziplock bag without puncturing it or ruining the "zipper"? -shoe

By Sharron [3]12/06/2010

Just a bit of an update. I tried the water in the bag method but I think the flies were way to wiley to fall for that trick, we have been inundated with flies since the beginning of the warmer weather this year. They seem to be more aggressive too. Maybe my imagination so its back to the mortein or raid. Thanks again to all for your input.

By heatherusry12/03/2010

The copper pennies keep the bags from getting algae. The pennies aren't necessary to keep the flies away. You just have to change the bag once the water starts getting green.

By Sharron [3]08/16/2010

I'd like to thank everyone for their input regarding my question. I will try the "plain water" version and also will try to put some different other coins in one or two to see what will happen - also, thank you to the kind lady who offered to send me some pennies.

By Vi Johnson [231]08/03/2010

Sharron, I'd be happy to mail you some pennies for you to try. Have ThriftyFun send me your mailing address. Several cousins have used this trick for years. I only found out about it about 6 years ago. And it does work. Good Luck,
Great Granny Vi

By Terri08/03/2010

I don't know what purpose the coin serves. I fish a lot and I know of several bait shops in Texas and Arkansas that have open live bait vats and they swear by those hanging ziploc bags of water. I never noticed a coin in any of them, but lately I've heard of the coin addition, too.

By Jonnie Shambarger [2]08/03/2010

Why not try a brown (or other dark color) button?

By Beverly08/02/2010

I have 3 of the bags hanging on my back porch. Although they haven't deterred 100% of the flies, it has made a HUGE difference. I am now thinking of putting them on my front porch as well.

By di07/29/2010

I have plastic bags hanging at both of my outside doors and no flies! Have not used any other coin but the penny, but the contrast color against the baggie and water is what gives it the "bug eye" look.


Here are questions related to Do Ziplock Bags With Water and Coins Really Repel Flies?.

Question: Water and Pennies Home Remedy for Flies

I was reading on T/F about a remedy for deterring flies using pennies, basil, and water in a Ziploc bag. How does this work and would it work indoors? Many thanks. Helen xxx

By Helen from United Kingdom

Most Recent Answer

By Robyn [361]05/31/2011

I have seen this in many different forms, the most popular of these being the mason jar of water with aluminum foil floating in it. I have seen the baggies with the pennies. The idea behind this is the difference in light vibration and waves or refraction. Here is some more info.

I have been in a restaurant that had jars of tin foil all over the place on each table. Also these kept flies off of a neighbor's porch one summer. As for really knowing why, we can only guess!


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