Producing high quality and efficient Continuous 
De-lonisation stacks.

EDI is a chemical-free process to produce Ultra-Pure Water by removing ions
from Reverse Osmosis product water via electric potential.
Electrodeionisation is a logical evolution of conventional ion exchange
technology. Equal to conventional ion exchange, in the ion exchange resins
cations and anions from the feedwater are exchanged for hydrogen and
hydroxyl ions, producing high purity demineralized water. The key operational
difference and a main feature of EDI are that the resins are regenerated
continuously without the use of chemicals. This electrochemical process is
achieved by ion-conducting membranes under a DC current. Hydrogen and
hydroxyl ions are formed by the water dissociation reaction (water splitting) and
regenerate the resins continuous without adding any chemical reagents.

H O ↔ H + OH

The electric potential at each end of the module drives the water splitting and at
the same time causes the ions to migrate to the selectively permeable
membrane where they pass to the next concentrate chamber. Once the ions are
trapped in the concentrate compartment they are carried away by the
concentrate stream.