SEDI™ – Selectra Electrodeionization The Next Stage in High-Purity Water
The Next Stage in High-Purity Water
WHAT IS SEDI™?
SEDI™ (SelectraElectrodeionization) is a next-generation water purification technology developed by InfraCorp to address the limitations of conventional Electrodeionization (EDI) systems By intelligently separating the treatment of strongly and weakly ionized impurities into two independent voltage-controlled stages, SEDI™ ensures higher performance, greater reliability, and lower scaling risk in high-purity water applications . Unlike traditional EDI, which applies a uniform voltage across all contaminants, SEDI™ features a dual-stage, voltage-controlled process that independently targets both strongly and weakly ionized impurities. This intelligent separation results in higher ion removal efficiency, improved system reliability, and significantly reduced scaling risk—making SEDI™ ideal for high-purity water applications in industries such as semiconductors, pharmaceuticals, power generation, and research laboratories
HOW IT WORKS
Conventional EDI uses a uniform voltage across the module, which limits removal efficiency for weakly ionized species and increases risk of scale formation.
SEDI™ solves this by introducing a two-stage design:
- Stage 1 – Low Voltage Zone: Targets strongly ionized impurities like Ca²⁺, Mg²⁺, SO₄²⁻ efficiently, reducing risk of precipitation.
- Stage 2 – High Voltage Zone: Removes weakly ionized impurities such as CO₂, SiO₂, and B with enhanced driving force.
- Dual Reject Streams: Independent ion removal streams reduce cross-contamination and improve system robustness.
KEY VALUE DRIVERS
- Superior Ion Removal Efficiency
Independent optimization of removal zones maximizes performance for both strong and weak ions—including CO₂, silica, and boron—often left behind in standard EDI. - Minimized Scaling and Fouling
Low-voltage pre-removal of scaling-prone ions (Ca²⁺, Mg²⁺, SO₄²⁻) significantly reduces precipitation risk, increasing uptime and membrane life. - Enhanced System Reliability
Dual reject stream design isolates ion flows, reducing cross-contamination and maintaining long-term purity standards. - Energy-Efficient Operation
Smart voltage staging enables lower total energy consumption compared to traditional high-voltage EDI systems.
- Compact, Integrated Design
Enables seamless retrofitting or integration into ultrapure water
- systems across industries including semiconductors, pharma, and power generation.
SEDI™ TECHNOLOGY VALUE PROPOSITION
Precision Purification. Elevated Performance.
SEDI™ (SelectraElectrodeionization) delivers a step-change in water purification by overcoming the critical limitations of conventional EDI systems. With a dual-zone, voltage-controlled architecture, SEDI™ intelligently separates the treatment of strongly and weakly ionized contaminants, enabling higher efficiency, lower fouling risk, and improved operational stability.
INDUSTRY APPLICATIONS
Semiconductor Manufacturing / Ultra-Pure Water for Advanced Node Fabs
As chip geometries shrink to 5nm and below, ionic purity becomes critical. SEDI™ delivers consistent 18.2 MΩ·cm water while removing trace contaminants like CO₂, boron, and silica that compromise wafer yield.
Benefits:
- High rejection of weakly ionized species
- Minimal scaling in continuous recirculation loops
- Compact footprint for integration with UPW skids
Optimized for CO₂/silica polishing in final stage treatment
Pharmaceutical & Life Sciences
SEDI™ supports the production of water that meets global pharmacopeia standards (USP, EP, JP) for Highly Purified Water (HPW) and Water for Injection (WFI). Its chemical-free operation and thermal sanitization compatibility make it ideal for GMP-compliant environments.
Benefits:
- No resin regeneration or chemical handling
- Reduced biofilm formation risk
- Compatible with hot water sanitization
Seamless integration into cleanroom and validated systems
Power & Boiler Feedwater
For power generation and high-pressure boiler systems, SEDI™ offers consistent polishing of make-up water by removing silica, CO₂, and residual hardness—protecting assets and improving efficiency.
Benefits:
- Prevents scale in boiler tubes and turbines
- Operates reliably under fluctuating plant loads
- Lower OPEX vs. mixed-bed DI systems
Simple maintenance for unmanned or remote operations
Laboratory & R&D Facilities
Laboratories depend on water that won’t interfere with sensitive instrumentation. SEDI™ delivers ultrapure, low-TOC water for applications including IC, HPLC, ICP-MS, and molecular diagnostics.
Benefits:
- Stable resistivity at 18.2 MΩ·cm
- Removes trace ions and CO₂ that affect assay integrity
- Low maintenance and no consumables
Integrates with UV, UF, and recirculation modules
