... Electrodeionization, referred to as EDI, is a ultra-pure water manufacturing technology that combines ion-exchange technology, ion-exchange ... cation membrane, anion through anion membrane). When cation in water is moving to the negative direction through cation membrane, ... , concentration and purification can be achieved.Characteristics 1. High water quality, the resistivity up to 10 ~ 16 MΩ.CM2. ...