Fouling or scaling, i.e., the occurrence of deposits on tubes, heat exchangers, and other devices, is a common problem in industrial and domestic processes. Many anti-fouling techniques exist, both chemically and non-chemically. The efficiency of non-chemical methods is still controversial, although the use of these devices is already widespread in industry. In this contribution, a case study is presented in which the operation of such a device is demonstrated. The electronic water treatment device under study was connected to a 2 m-long copper tube immersed in a water bath with a tempera cure of 65 degrees C. A short-term experiment revealed that the device did not alter the water chemistry and that locally, fouling was prevented by the device. However, the potential for fouling further downstream was not reduced. A long-term experiment further confirmed the findings of the short-term experiment showing that locally, the device has an anti-fouling action as a significant increase in weight was observed when the device was switched off and a significant decrease in weight was observed when the device was switched on.