Advanced electrodialysis reversal system

FlexEDR is an advanced electrodialysis reversal (EDR) platform that leverages our next-generation ion exchange membranes. It requires less pre-treatment, tolerates oils and organics, selectively removes ions and uses fewer chemicals than competing technologies.

For the Most Rugged Applications

Saltworks’ FlexEDR is designed and built with:

  • Our robust, highly ductile IonFlux ion exchange membranes.
  • Intelligent automation including self-cleaning to maintain peak performance.
  • Modular skids for easy deployment and project integration.
  • Fewer pre-treatment requirements for operation with oils, organics, and particles smaller than 20 μm.
  • No chemical softening needed: patented electrode protection blocks hardness out of the EDR electrolyte, so you do not need to remove it before treatment.
FlexEDR Electrodialysis Reversal Stack Inside a Saltworks Technologies Pilot Plant
Play Video about Monovalent electrodialysis stack

FlexEDR Organix

Desalt Organics-Containing Wastewaters & Produced Water


FlexEDR Organix desalinates wastewater and produced water with high concentrations of organics.

  • Treat oily wastewaters, which swell conventional membranes, with our resilient, next-generation IonFlux membranes.
  • Reduce the need for complex pre-treatment.
  • When you only need to remove salt, desalt high organic wastewaters not suitable for reverse osmosis—leave the organics in, take the salt out.

Desalt Produced Water for Enhanced Oil Recovery (EOR)

Remove more oil and lower consumption of polymers in EOR:

  • Save substantially on polymer costs by desalting produced water as your make-up water.
  • Reduce disposal and make-up water costs by economically desalinating produced water for reinjection at lower salinities.
  • Reuse some polymers in produced water by desalinating with FlexEDR Organix.

FlexEDR Selective

Remove Ions With Game-Changing Selectivity

In contrast, conventional EDR pulls all ions across ion exchange membranes under an electric field, without a membrane pressure differential. FlexEDR Selective:

  • Removes specific ions using state-of-the-art ion exchange membranes with 98% monovalent ionic selectivity (e.g. lithium or separation of chlorides from sulfates).
  • Changes brine chemistry without softening to reach the full potential of reverse osmosis systems and wring out even more freshwater for beneficial reuse.
  • Concentrates brine to low volumes with membranes—territory previously reserved for evaporative systems.
  • Is tunable and can be applied in different configurations based on the ionic separation needed for each application.

Highly Selective Separation and Extraction

  • Extract chlorides from circulating water to enable greater internal recycling or reduce corrosion.
  • Refine sodium chloride from complex saline streams.
Photo of a FlexEDR E150 stack with a transparent background
Photo of a FlexEDR stack in a full-scale plant with a Saltworks Engineer

FlexEDR™ Services

Maximize Your FlexEDR Investment

  • Saltworks provides a full suite of FlexEDR™ services to help you achieve the optimal solution for industrial desalination, brine treatment, volume reduction, and chemical recovery applications.
  • Initial consulting and technical advice to understand treatment options, residuals management, and balancing capital and operating costs.
  • Process design for maximum recovery and optimal integration with your other treatment process.
  • Engineering and design services to build and quality assure your full-scale plant.
  • Bench and pilot testing services, including mobile systems for rapid on-site deployment.
  • Comprehensive support including testing and remote monitoring.
  • R&D capability for unique applications.

Contact us to see if FlexEDR is the right fit for your water treatment process.

Looking for more in-depth knowledge on electrodialysis reversal? Learn exactly what EDR is and about its new innovations. 

Related Resources

A photo of a Saltworks FlexEDR pilot plant operating on-site at EPRI

EPRI Publishes Report: Successful FGD Industrial Water Reuse

Saltworks welcomes a new report by the Electric Power Research Institute (EPRI) summarizing results from a pilot completed at a large coal power plant in the US. FlexEDR monovalent electrodialysis reversal treated FGD wastewater, recovering 93% freshwater.