Continuous Electrodeionisation (CEDI)

EDI system combining ion exchange resins and ion-selective membranes with a current for high-purity water production.

EDI system combining ion exchange resins and ion-selective membranes with a current for high-purity water production.

Continuous electrodeionisation (CEDI) is a water treatment electrodeionisation technology that combines ion exchange resins and ion-selective membranes with direct current to remove ionised species from water. Reverse osmosis (and sometimes membrane degassing) is typically used as a pre-treatment prior to CEDI to ensure that the CEDI stack is not overloaded with high levels of salts. The CEDI technique can achieve very high-purity water, with conductivity below 0.1 µS/cm.

Benefits include:

  • Chemical-free water treatment
  • No regeneration downtime for continuous flow with consistent water quality
  • Skid-mounted, standardised systems for short lead times, quick installation and startup
  • Up to eight CEDI modules per skid for flexibility and high flow rates
Water Treatment Products

We have a complete portfolio of water treatment products and services to help you achieve a value-for-money solution alongside reliability, expertise and outstanding support.

Purified water treatment for the pharmaceutical, generics, healthcare and biotechnology markets.

Continuous electrodeionisation systems (CEDI) that produce high-purity water with chemical-free operation.

Reverse osmosis and CEDI to produce high-purity water with low bacteria levels for critical applications.

Water Treatment Applications

We design and manage innovative solutions for a wide range of water and wastewater treatment applications.

High-quality water systems for production, process and manufacturing uses.


Our teams of industry experts work with you to supply the water technologies and services you need to overcome challenges in your market.

Delivering compliant process and waste to recovery water for pharmaceutical/cosmetic needs.

Delivering ingredient water and waste to resource services in the food and beverage industry.

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