EDI (Electrodeionization) is a revolutionary water treatment technology; it is a membrane separation desalination technology that skillfully combined the electrodialysis technology and ion exchange technology together, which is high-tech, green and environmental protection technology.

 EDI equipment uses the RO outlet water as feed water. The resistivity of RO outlet water is normally 40-2μS/cm（25℃), the resistivity of EDI outlet water can reach 18MΩ.cm (25℃) normally. According to the application of deionization water and the setup of the system, EDI outlet water can meet the requirements of resistivity 1-18.2MΩ.cm (25℃).

 The advantages of EDI equipment are continual water production, no acid and alkali regeneration, unattended operation etc. It has been replacing the mix bed as the fine treatment equipment gradually. Due to its higher environmental protection character, easy in operation, EDI has been accepted by more and more people and used in pharmaceutical, electronic, electricity, and chemical industry widely. Its appearance is a revolutionary progress of water treatment, which marked the water treatment industry finally entered into green industry.