I live in an area of the city that is the area between the high priced homes and the abandoned ghetto. Thanks to alley trash cans and vacant properties the area is pretty well infested with flies when it's hot out. After using this product I am AMAZED at how few flies have made it into my house. I used to have 6-12 hovering by my door at any given moment, now none. I rarely get the odd fly that sneaks inside now.