This electronic microprocessor-controlled device significantly reduces limescale deposits in water pipes, heating devices, heating rods, and similar applications. Even old limescale deposits can be broken down and flushed away over time. No intervention in the piping system is required for installation. The device incurs low operating costs and is adequately sized for a water consumption of up to 5 m³/h. It can be individually adapted to the respective piping system. The output frequencies can be set fixed or variable from 1 to 4 kHz, 4 to 8 kHz, 8 to 12 kHz, 12 to 16 kHz, and 16 to 32 kHz. With a properly selected frequency range, the efficiency of the device can be up to 30% higher than in automatic mode. The correct resonance frequency for a specific water system depends on various factors: water flow rate, water hardness, material, and diameter of the water pipes, etc., and can only be determined experimentally.