HMI Control Unit • The new generation of the Elgressy systems includes a motor scraper (instead of the piston), upgraded electrodes and HMI control system. • The HMI control system enable to measure the make up water of the water system, pH, conductivity, flushing control, circulation pump, motor scraper, digital power supply and etc, from any place in the world. • By using the HMI system we control and change the flushing time of the systems.