The control program, a Pyrotechnics control, is based on the dispersal of the birds through the injection of loud sounds into their flight paths. Two sounds repel the birds: a loud percussion noise, and the other being a high pitch, high volume wavering sound.
The projectiles to create this dispersion are launched with the applicator standing in an elevated position between the building and the flock of birds. Repetitive action is necessary to disperse the birds and daily service is needed until the infestation is eliminated.
The use of ultrasonic, and other aural roosting deterrent (audio) systems are not recommended. We have never seen any measured control to justify their use.