The invention relates to a horizontal agitator for producing a flow in a clearing basin, wherein a propeller having a plurality of blades is connected to a submersible motor axially disposed thereto. The system includes a water softener controller with a control processing unit for determining the status of the water softener. Then, at the first machining unit it holds the treated coarse aluminum casting that has been treated by the first machining unit with the holding means as well as transferring the untreated coarse aluminum casting from the holding means to the first machining unit.