Abstract: A method for surface treating a continuous flow of workpieces includes the steps of fluidizing a stationary bed of surface treating media, aggitating the fluidized bed of surface treating to create a scrubbing action to the surface treating media, and moving the workpieces to be treated through the stationary, fluidized aggitated media bed subjecting the workpieces to the scrubbing action of the media. Further, an apparatus for surface treating workpieces which includes a trough for containing a bed or pool of surface treating media, a force vibration generating device for imparting a reciprocating force, having at least a vertical force vector, to the trough and, therefore, to the surface treating media contained in the trough, and a means of conveying the workpieces to be treated continuously through the trough and, therefore, through the media.