The present invention relates to a method of identifying a filter, wherein the filter has at least one retentate side and at least one permeate side which are separated from one another by at least one filter medium, wherein the method comprises generating a pressure in a fluid, in particular in a liquid, on the retentate side or on the permeate side by means of a pressure source, in particular by means of a pump； switching off the pressure source； and the measurement of the pressure development in the fluid over time subsequent to the switching off of the pressure source.
