A water conditioning unit for a washing device is configured to provide water at different flow rates and with different spraying characteristics and with additives admixed to the water. The water conditioning unit includes an inlet fitting for attachment to a water supply and an outlet fitting for attachment to a dispensing unit as well as one, two or more docking adapters configured for attaching, one, two or more additive containers. Hydraulic elements guiding and controlling a flow of water between the inlet fitting and the outlet fitting are implemented in a hydraulic assembly having a total manifold and hydraulic elements. The total manifold has internal channels guiding the flow of water and carrying the hydraulic elements.