Abstract: For automatic bacteriological cleaning and disinfection of objects there is provided a series of treatment compartments which can be closed individually. The objects are fed sequentially into the compartments. They are treated with fluid therein in a predetermined cycle of operations. Liquid used in one compartment is recovered and collected for use in another compartment in a following cycle of operations. In one operation, objects are moved from a first compartment to a second compartment, fresh treating liquid is pumped from a tank associated with the second compartment into that compartment, and then this liquid is discharged directly to another tank associated with the first compartment.