Rethinking Electro Membrane Stacks for a sustainable future

Driving efficiency in carbon capture, resource recovery, and salt removal

Conventional methods for carbon capture, resource recovery, and water treatment often come with high costs, inefficiencies, and environmental concerns. REDstack’s electrochemical stacks eliminate these bottlenecks, making sustainability scalable and profitable.

The challenges we solve

Salt removal

Treating brackish or industrial wastewater requires enormous amounts of energy and creates high volumes of waste. REDstack’s Desalt-ED stacks make salt removal more sustainable by:

Energy-efficient salt removal (<0.15 kWh/m³)
Water recovery up to 95%
Modular, scalable design for various water recycling projects

Resource recovery

Recovering resource elements like lithium, nitrogen, and magnesium is traditionally chemical-intensive and wasteful. REDstack’s bipolar electrodialysis stacks enable:

Direct elemental recovery without chemical loss
Continuous acid reuse in nitrogen stripping, minimizing environmental impact
High-purity lithium extraction from brines for battery production

Carbon capture

Direct Air Capture (DAC) and Direct Ocean Capture (DOC) technologies require electrochemical support to be energy-efficient. REDstack’s EDBM stacks:

Extract CO₂ from alkaline solvents with zero liquid contamination
Enable 100% solvent reuse for continuous operation
Integrate seamlessly into DAC/DOC processes

REDstack - Pure Water Group (c) Fred Schuch

Our technology: The REDstack advantage

Our ElectroMembrane Stacks are at the core of industrial sustainability. They don’t just filter water or capture CO₂—they redefine how these processes work.

Desalt-ED: Smarter water recycling

Handling up to 36 m³/h flow and 250 kg TDS per hour, Desalt-ED removes up to 65% salt with an optimized design that prevents ionic shortcut currents, ensuring efficient, reliable water treatment.

EDBM cross-flow: High-purity CO₂ & resource recovery

With zero liquid contamination, EDBM Cross-Flow enables CO₂ capture, on-site caustic and acid production, and efficient ammonium recovery, delivering seamless, high-performance electrochemical separation.

Where REDstack technology is making an impact:

Industrial water recycling

REDstack’s Desalt-ED stacks are used for salt removal from treated effluent from three large paper mills, enabling water reuse and reducing groundwater intake.

Cooling tower water treatment

REDstack’s EDR stacks enable salt removal from cooling water blowdown without removing essential anti-foaming or antibacterial agents, ensuring stable, long-term operation.

Nitrogen & resource recovery

Our stacks facilitate recovery of nitrogen as NH3 and recovery of other resources such as lithium, caustic, etc. Eliminating unnecessary chemical consumption and lowering operational costs.

Direct air & ocean capture (DAC/DOC)

REDstack stacks are key components in CO₂ capture from air and seawater, working alongside partners like SeaO2 to drive innovation in carbon reduction.

Technical excellence & engineering support

All REDstack stacks undergo rigorous pressure and leak testing before leaving the factory, ensuring unmatched reliability. To meet increasing demand, we are scaling up production to continuous manufacturing, securing volume for large projects and cost-effective stack deployment.

Beyond product supply, REDstack offers:

Basic engineering packages (PFD, P&ID, instrumentation lists)
Process integration support
Stack health monitoring & service solutions