A new method for the classification of suspensions by means of rotating filter discs is presented. The classification without a filter cake buildup by means of a single shaft disc filter is possible using the high-frequency autodynamic backwashing method. High-frequency autodynamic backwashing results from an overpressure fluctuation between the filtrate and concentrate sides, resulting in different flow directions of the filtrate volume flow. The main parameters are the centrifugal force acting on the fluid inside the discs in combination with the fact that the discs are slightly inclined. It is demonstrated that the separation of coarse particles is entirely possible.