Fill the transparent bag with water and hang it up high outside your door.
Because a light source is required for the trick to work its magic, it’s best to keep the bag close to an outdoor light, lamp or torch so that you can keep flies at bay both night and day.
Why do flies hate this?
Most insect repellants are based on different fragrances or smells. This type of deterrent has nothing to do with scent, however, and a whole lot to do with how flies see the world.
Shiny coins in water create a discomforting, unpleasant sight for flies.
Flies have compound eyes, and as a result the device creates an illusion wherein they don’t want to go anywhere near the bags – or so it’s claimed.
What the insects see in the bag is light refraction; something that a human eye can easily handle. For a fly, however, it’s a completely different story, according to Tip Hero.
Let’s take the common house fly, for example. These insects are born with a huge pair of eyes relative to their size. Made up of between 3,000-6,000 lenses, these eyes see the world in a mosaic pattern. Pretty cool, right?
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