Hanging Water Bags Above Doorways: A Common Practice to Deter Insects

By boom Last updated Apr 9, 2025

In various regions, it’s a common practice to hang clear plastic bags filled with water above doorways and windows as a method to deter insects, particularly flies. The concept behind this technique is rooted in the idea that the water-filled bags create visual distortions that confuse the compound eyes of flies, leading them to avoid the area. Reddit+4The Sun+4The Scottish Sun+4

How It Works:

Visual Disorientation: Flies possess complex eyes that are sensitive to light reflections. The light refracted through the water-filled bag, especially when sunlight hits it, is believed to create an effect that disorients flies, making them perceive the area as less hospitable. HowStuffWorks+1thv11.com+1 97.5 NOW FM

Addition of Coins: Some variations of this method include placing coins, often pennies, inside the water-filled bags. The idea is that the coins enhance the reflective properties of the water, increasing the deterrent effect on flies. tasteofhome.com The Scottish Sun+2The Sun+2HowStuffWorks+2

Effectiveness:

While many individuals swear by this method, scientific studies present mixed results. Some research suggests that hanging water bags may have little to no effect on reducing fly activity, and in certain cases, could potentially attract more flies due to the reflective nature of the bags.

Alternative Natural Deterrents:

If you’re seeking natural ways to keep insects at bay, consider the following options:

Cucumber Slices: Flies are known to dislike the scent of cucumber. Placing cucumber slices near entry points can act as a natural repellent.tasteofhome.com+3The Sun+3cooktopcove.com+3

Aromatic Plants: Plants such as basil, lavender, marigolds, and nasturtiums emit fragrances that are unappealing to flies. Positioning these near windows and doors can help deter insects.The Sun+1The Scottish Sun+1 The Scottish Sun+1The Sun+1
Maintain Cleanliness: Regularly cleaning your living spaces and ensuring that food waste is properly disposed of can reduce attractants for flies and other pests.cooktopcove.com

While hanging water-filled bags above doorways is a widespread practice believed to deter insects, especially flies, scientific evidence supporting its effectiveness is limited. If you choose to employ this method, consider combining it with other natural deterrents and maintaining cleanliness to create a more comprehensive approach to pest control.