A method for automated cleaning of a filter basket in a bioreactor, wherein the filter basket is in fluid communication with a liquid tank on the outlet side, and wherein the filter basket is defined by filtering walls (201, 202) on a bottom side and on lateral sides, comprising - determining a permeability of the filter basket, comprising the steps of: a. controlling a suction unit by means of an electronic control unit to suction a residual liquid from a liquid tank through a drain line, b. subsequently controlling a liquid metering unit by means of the electronic control unit to dispense a liquid having a predetermined liquid volume into the filter basket through a flushing line, c. terminating dispensing of the fluid at a filter start time (tF), d. controlling, after a duration of a predetermined filter time interval (tZ), which starts at the filter start time (tF), has elapsed, the suction unit by means of the control unit to empty the liquid tank by suctioning a filtered liquid volume from the liquid tank through the drain line, e. measuring the volume (Vm) of the filtered liquid suctioned in step d) in a measuring unit and sending a first measurement signal representing a first measurement result from the measuring unit to the control unit, f. determining a first permeability quotient from the volume (Vm) of the filtered liquid suctioned in step d) to the volume of the predetermined liquid volume dispensed in step b) in the control unit, and g. comparing the first permeability quotient with a first predetermined permeability threshold by the control unit; and - controlling a cleaning unit to perform a cleaning process of the filter basket if the first permeability quotient is below the first permeability threshold. - determining a permeability of the filter basket, comprising the steps of: a. controlling a suction unit by means of an electronic control unit to suction a residual liquid from a liquid tank through a drain line, b. subsequently controlling a liquid metering unit by means of the electronic control unit to dispense a liquid having a predetermined liquid volume into the filter basket through a flushing line, c. terminating dispensing of the fluid at a filter start time (tF), d. controlling, after a duration of a predetermined filter time interval (tZ), which starts at the filter start time (tF), has elapsed, the suction unit by means of the control unit to empty the liquid tank by suctioning a filtered liquid volume from the liquid tank through the drain line, e. measuring the volume (Vm) of the filtered liquid suctioned in step d) in a measuring unit and sending a first measurement signal representing a first measurement result from the measuring unit to the control unit, f. determining a first permeability quotient from the volume (Vm) of the filtered liquid suctioned in step d) to the volume of the predetermined liquid volume dispensed in step b) in the control unit, and g. comparing the first permeability quotient with a first predetermined permeability threshold by the control unit; and a. controlling a suction unit by means of an electronic control unit to suction a residual liquid from a liquid tank through a drain line, b. subsequently controlling a liquid metering unit by means of the electronic control unit to dispense a liquid having a predetermined liquid volume into the filter basket through a flushing line, c. terminating dispensing of the fluid at a filter start time (tF), d. controlling, after a duration of a predetermined filter time interval (tZ), which starts at the filter start time (tF), has elapsed, the suction unit by means of the control unit to empty the liquid tank by suctioning a filtered liquid volume from the liquid tank through the drain line, e. measuring the volume (Vm) of the filtered liquid suctioned in step d) in a measuring unit and sending a first measurement signal representing a first measurement result from the measuring unit to the control unit, f. determining a first permeability quotient from the volume (Vm) of the filtered liquid suctioned in step d) to the volume of the predetermined liquid volume dispensed in step b) in the control unit, and g. comparing the first permeability quotient with a first predetermined permeability threshold by the control unit; and - controlling a cleaning unit to perform a cleaning process of the filter basket if the first permeability quotient is below the first permeability threshold.