EDI (electrodeionization) An EDI plant is used after RO for polishing of demineralized water to obtain low levels of conductivity and silica. EDI is an alternative to a conventional mixed-bed polisher. Typical applications for EDI: Boiler feed water at heat and power plants, process water within the electronic industry, the pharmaceutical industry, and hospitals and laboratories. Plant description Flow rates for standard modules: 125 l/h - 10.2 m³/h. EDI plants are either produced as standard modules or specially designed according to requirements. Advantages EDI is a continuous process and utilizes chemical-free regeneration. Therefore, regeneration downtime is eliminated and storage and handling of acid and lye are avoided. The plants are space-saving on account of the very compact design. The plants are of high quality, need minimum maintenance and the reliability of operation is very high.