A model of the aerodynamic characteristics of a spray tower is developed involving forces acting on a single droplet moving in a spray. Relations for the pressure drop, dispersed phase concentration, and residence time along the scrubber height obtained for this model are evaluated. A comparison of the poly- and monodispersed sprays behavior is performed. Certain simplifications introduced into the model are discussed, The pressure drop predicted by a two-parameter model (initial droplet velocity and droplet interaction coefficient) agrees with good accuracy with the experimental data collected in two large pilot-plant scrubbers.