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.

What is Continuous Electrodeionisation (CEDI)?

Electrodeionisation (EDI) is a high-efficiency water demineralisation process. Systems use electricity, resins and ion exchange membranes to separate dissolved impurities (ions) from water. Continuous electrodeionisation (CEDI) means that the electric current continuously regenerates the required resin mass.

CEDI Water Treatment Systems

Veolia Water Technologies' CEDI systems avoid issues with exhausted resin beds requiring regeneration or replacement. CEDI systems don't require any water treatment chemicals and they provide a consistent flow of high-quality water, suitable for many applications. Reverse osmosis (RO) water treatment systems are typically used prior to CEDI to ensure that the CEDI system is not overloaded with high levels of salts.

CEDI Applications and Benefits

CEDI process water systems are used in a wide range of applications and industries:

  • Food and beverage
  • Pharmaceutical
  • Chemical processing

The key benefits of CEDI in these applications include:

  • Chemical-free water treatment
  • Continuous water flow with consistent, known water quality
  • Zero resin bed regeneration downtime
  • Fast system installation and startup
  • Standardised systems mean short lead times
  • Flexible system design with high flow rates

Water Treatment Products

Plug and play RO-CEDI demineralised water for the power market

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

Extensive range of reverse osmosis systems for all water applications and budgets.

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.

Water pretreatment solutions for all types of feed and influent water.


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.

Providing water treatment solutions for healthcare applications.

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

Maintaining water quality and controlling the environmental impact of industrial water treatment.

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