- The method involves filling clear plastic bags with water, tying them up and hanging them in areas such as windows and doorways. Some variations call for putting a penny or a tin foil in the bag.
- According to proponents of the method, the water produces a large reflection of the fly when it tries to fly in, scaring the fly away. Other theories claim that the fly mistakes the bag as a large spider web or that the water distorts the fly's vision, confusing it.
- No logic or evidence supports the efficacy of the water bag method, according to the University of Minnesota Extension. One study by the North Carolina Mosquito and Vector Control Association even found that areas with water bags have higher fly activity.
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