Washing machine and methods for operating a washing machine

A washing machine having:

• a drum for washing laundry therein, a drum-receiving container in which said drum is arranged rotatably about an axis of rotation,
• a water routing system which has:
• a water inlet from an external water supply into said washing machine,
• water lines and valves,
• a water outlet from said washing machine,
• an input device for water into said drum,
• at least one container drain at a bottom of said drum-receiving container,
• a pump which is connected by way of water lines to said at least one container drain and to said input device,
• a washing machine controller to which said pump is connected,
• wherein:
• an outer shape of said drum is round cylindrical or round,
• an inner shape of said drum-receiving container is not round cylindrical or not round,
• along a circumferential direction of said drum, said drum has a radial distance from said drum-receiving container, wherein said drum-receiving container is configured such that said distance:
• continuously varies in places and/or has no discontinuity,
• is smaller in an uppermost region of said drum than at a mid-vertical height of said drum,
• is at its greatest in a lower region of said drum between a lowermost point of said drum and one third of a vertical height of said drum,
• is smaller at said lowermost point of said drum than in said lower region of said drum which is located vertically above said lowermost point,
• between said drum and said drum-receiving container is at its greatest in a circumferential direction up-and downstream of said lowermost point, said at least one container drain from said drum-receiving container being arranged here
• wherein:
• a breakaway edge for water located on an outside of said drum is formed in said lower region or at said lowermost point of said drum on an inside of said drum-receiving container, and
• said distance from said drum-receiving container to said drum is at its smallest at said breakaway edge.