In this page you find some photos of the Osmosis cleaning. Osmosis water is filtered / cleaned in the night and has hardly any particles left in the water. Expecially the chalk has been removed. Benefit is that you do not have to dry up the windows, and still no white spots are left at the window. Second benefit is that it saves the washers a lot of time, and at the end is even more economic than traditional cleaning for cleaning the windows behind the louvers.