Patent ID: 6951614

Claim:
A method of filtering liquids with a filtration device having at least first and second filter lines and having at least one preliminary filter unit and at least one end filter unit in each of the filter lines, each of the filter units being insertable and removable from fluid communication with the respective filter line and being regenerated independently of one another, the method comprising the steps of: measuring pressure differential at at least one filter unit in each of the filter lines; reducing volume flow of liquid to be filtered entering the filtration device when a preset limiting value for the pressure differential measured is reached in one filter unit; after reducing the volume flow, disengaging the one filter unit from fluid communication with the respective filter line, conveying the reduced volume flow through at least one filter unit in the other filter line, and conveying the reduced volume flow through a third line connecting the first and second filter lines between the preliminary filter units and the end filter units thereof; regenerating the filter unit which was disengaged; re-engaging the filter unit which was regenerated into fluid communication the respective filter line; and increasing the volume flow of liquid to be filtered into the filtration device after re-engagement of the filter unit which was regenerated.