Abstract: A method and apparatus for filtering, especially for filtering beer, in which a filter having an inlet and an outlet has the outlet connected with the conduit system leading to first and second tanks and to drain. The filter is flushed with water periodically and a control system is provided which senses the density of the fluid at the filter outlet and controls valves in the conduit system. The control of the valves provides for diverting fluid from the filter outlet from a first beer storage tank to an intermediate tank when the density of the fluid at the filter outlet is modified by water and then from the second tank to drain when the density of the fluid at the filter outlet stabilizes.