Abstract: Method for controlling a pump station including a pump well for accommodating liquid and at least one pump located in the pump well for pumping liquid from the pump well, the at least one pump having an inactive state and an active state, respectively. The method includes initiating a pump cycle having a predetermined pump cycle length, bringing the at least one pump to the active state, registering a pump start time of a pumping duration time interval, and calculating a pump stop time for the pumping duration time interval to occur when the quantity of liquid pumped during the pumping duration time interval, as calculated from a predetermined pump capacity of the pump, is greater than or equal to a calculated liquid inflow to the pump well during the present pump cycle. The at least one pump enters said inactive state when the pumping duration time interval has elapsed.

Abstract: This invention relates to a nozzle which via a hose is connected to a vacuum source for removing to a collecting container dissolved and scraped away paint residues from previously painted surfaces. The nozzle comprises a base part (10) being connected to the hose, said base part having an opening (11) through which air, together with the dissolved paint residues, are sucked. The base part has supply means (13) for liquid through which i.e., for example, water is supplied to the nozzle in order to promote the transportation of the paint residues through the hose, and a control device (15) by means of which the liquid supply to the nozzle can be adjusted. The nozzle also comprises a tool or tool holder (18) which is exchangably fastened to the base part (10) and is arranged to mechanically treat the surface from which the paint residues are sucked away.