Esschert Design Fly Deterrent Bulb

The bulb works by creating a visual disruption for flies. When filled with water, the glass sphere acts as a magnifying lens, and the combination of refracted light and subtle movement confuses the insects, encouraging them to avoid the area.

Yes, it is completely safe. Because it uses a physical, non-toxic method to deter flies rather than chemicals, sprays, or traps, there is no risk of harmful exposure to children or pets.

While it does not strictly require direct, harsh sunlight, placing it in a location where it can catch natural light will maximize the refractive effect. The more light that passes through the water-filled glass, the more effective the visual disruption will be.

You should change the water whenever it becomes cloudy or if algae begins to grow, which can happen over time due to sun exposure. Keeping the water clear ensures the light refraction remains effective.

This product is designed specifically for outdoor use on patios, decks, or in gardens. It is not intended for indoor spaces, as the deterrent effect relies on natural light and outdoor airflow to create the necessary movement.