Abstract: The invention concerns a method and a device for separation of separable constituents from a liquid medium. The separation device comprises only one cell or a stack of a plurality of adjacent cell, whereby each cell consists of a plate unit containing a filter, an inlet for supplying the liquid medium into a chamber, and outlet for discharging the reject and an outlet for discharging the permeate. The liquid medium is subjected to a strong turbulence created by a convenient designed rotor, possible combined with sound waves, whereby the deposition of separable constituents on the filter is prevented or essentially reduced.