Patent ID: 8601625

Claim:
A washing machine, comprising: a program controller for controlling a program sequence; a drum rotatably supported in a tub; a liquor drain system on a floor of the tub; a liquor drain pump; a drive motor for driving the drum; a heater; a sensor for determining an amount of liquid or of suds in the tub that sense a hydrostatic pressure, a time gradient of the hydrostatic pressure, and/or a guide value in the tub or the drum; and a switch for rotating and stopping the drum and for increasing the speed of the drum if the hydrostatic pressure is less than a predetermined lower value in order to increase a concentration of the suds in the tub to within a predetermined range, and for decreasing the speed of the drum if the hydrostatic pressure is more than a predetermined upper value in order to decrease the concentration of the suds in the tub to within the predetermined range, the predetermined lower value being different than the predetermined upper value to define the range of concentration, the program controller programmed to control the switch to rotate and stop the drum and to increase the speed of the drum if the hydrostatic pressure is less than the predetermined lower value in order to increase the concentration of the suds in the tub to within the predetermined range, and to decrease the speed of the drum if the hydrostatic pressure is more than the predetermined upper value in order to decrease the concentration of the suds in the tub to within the predetermined range.