I'm having an especially horrible fly problem, but mine does'nt have to do with my horses or even outside. I have a cluster fly problem in my house. I have a sliding glass door and two floor to cieling windows that stretch about 20 feet across the entire room. The flys gather behind the curtains. When I pull them back, to massacre the bunch, it's absolute mayhem until I've killed every last one
. Doesn't matter though, because a couple hours later there will be a new bunch to take their place. Then there's at least ten at a time that escape their safe place to buzz around the house, in your face, land on your food, all that fun stuff. I'm probably going to order the Cluster Buster. Funny name, but it's gotten good reviews.