Baffles in mixing tanks are necessary to achieve a high energy input. A similar energy input can be achieved by reverse mixing in an unbaffled vessel. This paper deals with performing stirring processes in a Reynolds number range between 550 and 38 900 by reversing the stirrer direction stepwise and periodically. An optimum time interval for switching the stirrer direction regarding the power input was found by evaluating the single-cycle response after switching the stirrer direction and analysation of the cumulative energy introduced. The obtained switching intervals were applied for further investigations regarding geometrical parameters like stirrer diameter, liquid level, and eccentricity of the stirrer. The experiments conducted under lab-scale conditions generally showed that short switching intervals result in higher power consumptions. For short periods of constant stirrer speed, the advantage of small stirrer diameter at large aspect ratios vanishes. A highly eccentric stirrer shows worse results regarding the power characteristics than a centric one.