A dishwasher comprising: a tub at least partially defining a washing chamber; a liquid spraying system (54, 56) supplying a spray of liquid to the washing chamber; a liquid recirculation system (50, 34) recirculating the sprayed liquid from the washing chamber to the liquid spraying system (54, 56) to define a recirculation flow path; and a liquid filtering system comprising: a shroud defining an interior; and a rotating filter located in the shroud and in the recirculation flow path such that the recirculation flow path passes through the rotating filter from the upstream surface to the downstream surface to effect a filtering of the sprayed liquid; characterized in that: the rotating filter has a first filter element forming an upstream surface and a second filter element forming a downstream surface and wherein the first filter element is more resistant to foreign object damage than the second filter element; the recirculation flow path circumscribes at least a portion of the shroud and enters into the interior through an inlet opening in the shroud, the inlet opening facing downstream to the recirculation flow path where it circumscribes the shroud; an internal flow diverter is disposed inside the rotating filter, the internal flow diverter acting as an artificial boundary which overlays at least a portion of the filter to form a backflow zone where the liquid flows from the downstream surface to the upstream surface, the internal flow diverter being formed by two concave deflector portions joined to form a single artificial boundary having an S-shape cross section and being spaced about the downstream surface of the rotating filter. a tub at least partially defining a washing chamber; a liquid spraying system (54, 56) supplying a spray of liquid to the washing chamber; a liquid recirculation system (50, 34) recirculating the sprayed liquid from the washing chamber to the liquid spraying system (54, 56) to define a recirculation flow path; and a liquid filtering system comprising: a shroud defining an interior; and a rotating filter located in the shroud and in the recirculation flow path such that the recirculation flow path passes through the rotating filter from the upstream surface to the downstream surface to effect a filtering of the sprayed liquid; the rotating filter has a first filter element forming an upstream surface and a second filter element forming a downstream surface and wherein the first filter element is more resistant to foreign object damage than the second filter element; the recirculation flow path circumscribes at least a portion of the shroud and enters into the interior through an inlet opening in the shroud, the inlet opening facing downstream to the recirculation flow path where it circumscribes the shroud; an internal flow diverter is disposed inside the rotating filter, the internal flow diverter acting as an artificial boundary which overlays at least a portion of the filter to form a backflow zone where the liquid flows from the downstream surface to the upstream surface, the internal flow diverter being formed by two concave deflector portions joined to form a single artificial boundary having an S-shape cross section and being spaced about the downstream surface of the rotating filter.