Patent ID: 7935195

Claim:
A multi-tank dishwasher with at least one washing zone for acting upon a wash batch with washing water in a washing chamber, the at least one washing zone comprising: at least one washing water storage tank; at least one filter housing; at least one fine filter introduced into the at least one filter housing, the at least one fine filter subdividing at least one inner space of the at least one filter housing into at least one dirty water space and at least one clean water space, the at least one dirty water space being capable of being acted upon with washing water from the washing chamber via at least one washing water inflow, the at least one fine filter having at least one filter wall, in such a way that, in a normal operation of the multi-tank dishwasher, washing water flows from the at least one dirty water space through the at least one filter wall into the at least one clean water space, and the at least one clean water space being connected to the at least one washing water storage tank via at least one outflow device whereby clean water flows from said at least one clean water space to said at least one washing water storage tank; and at least one backwash device comprising: at least one washing water return connected to the at least one clean water space; at least one backwash pump; at least one sewage line connected to the at least one dirty water space; and at least one sewage pump, wherein, in a backwash operation, a washing water flow between the at least one clean water space and the at least one dirty water space through the at least one filter wall is reversible via the backwash device.