Electronics
Continuous high-purity water route selected around confirmed process-water requirements.
Industrial Pure & High-Purity Water SystemsEngineering Support from Dongguan, China
RO + EDI System
RO + EDI High-Purity Water System
A connected treatment train that combines RO primary desalination with continuous EDI polishing for confirmed high-purity production-water requirements.
- Feed water
- Pretreated water / RO permeate
- Application
- High-purity industrial production
- Treatment route
- Pretreatment → RO → EDI
- Control
- PLC / HMI available
CapacityProject engineered
Feed waterPretreated water / RO permeate
ApplicationHigh-purity industrial production
Treatment routePretreatment → RO → EDI
ControlPLC / HMI available
Applications
Where This System Is Used
A connected treatment train that combines RO primary desalination with continuous EDI polishing for confirmed high-purity production-water requirements.
Lithium battery
RO and EDI are reviewed against target water quality, demand and operating hours.
Pharmaceutical utilities
System scope can align with agreed monitoring, materials and documentation requirements.
Photovoltaic
High-purity water configurations are evaluated around specified manufacturing duties.
Precision manufacturing
EDI polishing is selected where a consistent high-purity water stage is required.
Industrial laboratories
RO + EDI can provide a stable high-purity water basis for confirmed utility duties.
Operating EnvironmentInstallationIndoor / sheltered / containerized Operating modeContinuous / batch ElectricalConfigured to destination FootprintProject-specific Service accessMaintenance clearance required
System Overview
A Connected RO and EDI Treatment Train
RO provides primary desalination; EDI then continuously removes residual ions from correctly conditioned RO permeate.
The two technologies perform different roles. RO reduces the dissolved-salt load, while EDI acts as a high-purity polishing stage. Pretreatment, RO permeate quality, monitoring and distribution interfaces are engineered together.
- RO primary desalination
- Continuous EDI ion-removal polishing
- No conventional acid/alkali resin regeneration
- Integrated quality-monitoring options
Feed Water & Product Water
RO Permeate & Final Water Requirements
EDI performance depends on a suitable, correctly conditioned RO-permeate feed and a clear high-purity water target.
| Design Input | Required Information | Why It Matters |
|---|---|---|
| Source-water analysis | Water analysis required | Sets pretreatment and RO design basis. |
| RO permeate quality | Confirmed during engineering | Determines EDI feed suitability. |
| Hardness / silica | Confirmed during engineering | Helps protect upstream RO and maintain polishing stability. |
| CO₂ / dissolved gases | Confirmed if applicable | May guide degassing or EDI feed conditioning review. |
| Final conductivity | Confirmed by process requirement | Defines final quality monitoring and diversion logic. |
| Capacity / hours | Project-specific | Defines train sizing, storage and redundancy. |
Treatment Process
RO + EDI Treatment Process
The final configuration follows the feed-water analysis and the high-purity water requirement.
Feed water
Source water enters on the confirmed engineering basis.
Pretreatment
Protects downstream RO according to water chemistry.
RO
Provides primary desalination and conditions water for polishing.
RO permeate
Quality is reviewed for EDI suitability.
EDI
Continuously removes residual ions from suitable RO permeate.
High-purity water
Monitored water is sent to storage, distribution or confirmed use points.
Technology decision
Why Add EDI After Reverse Osmosis?
RO and EDI are not interchangeable. They are paired when a continuous polishing stage is needed after RO primary desalination.
PretreatmentRORO permeate
Best for
- Primary desalination
- Dissolved-salt reduction
- Process-water basis
RO handles the main dissolved-salt reduction and creates the feed basis for the next stage.
RO permeateEDIHigh-purity water
Best for
- Continuous ion removal
- High-purity water
- No routine chemical regeneration
EDI polishes correctly conditioned RO permeate with continuous electrode-driven ion removal.
PretreatmentROEDIUse point
Best for
- Battery
- Electronics
- Precision manufacturing
The selected train includes monitoring, interlocks and distribution according to the confirmed project duty.
Not sure which configuration fits your project?Ask an Engineer
Technical Specifications
RO + EDI System Specification Guide
Final values are established through water analysis, RO permeate assessment and required high-purity water quality.
| Parameter | Typical Option / Range | Engineering Note |
|---|---|---|
| Capacity | Project-specific | Sized from flow, peak demand and operating profile. |
| Primary stage | RO | Designed from source-water chemistry. |
| Polishing stage | EDI | Applied to suitable, conditioned RO permeate. |
| Conductivity / resistivity | Confirmed by process requirement | Defines monitoring and final-water control. |
| Degassing | Optional | Reviewed where dissolved gases affect the treatment basis. |
| Controls | PLC / HMI options | RO and EDI sequencing follows approved scope. |
Inside the system
RO and EDI, Each With a Defined Role
- 01Pretreatment interface
- 02RO membrane vessels
- 03High-pressure pump
- 04RO permeate conditioning
- 05EDI stack
- 06DC power supply
- 07Quality instruments
- 08Product-water tank
- 09Control cabinet
Component and brand selection can be discussed according to the approved project requirements.
IMAGE_REQUIREDCONTROL CABINET / HMI PHOTOA real control-panel image is required for this module.
Automation
Automation for a Connected Treatment Train
RO and EDI sequencing, quality monitoring and protective logic are configured around the approved operating scope.
- RO / EDI sequence control
- RO permeate quality interlocks
- EDI power and alarm logic
- Conductivity monitoring
- Flow monitoring
- Tank-level interlocks
- Automatic flushing
- Remote monitoring optional
Optional Configuration
Configuration Stages Selected Around the Project
Optional modules are selected after verifying feed-water chemistry, target quality and operating conditions.
Pretreatment
Multimedia filtration
Activated carbon
Water softener
UF pretreatment
Chemical dosing
RO + EDI
Second-pass RO
Membrane degasser
EDI redundancy
Quality diversion
Final filtration
Project options
CIP
Remote monitoring
Container enclosure
Material options
Documentation scope
Before Installation
What Should Be Confirmed Before Installation?
Feed-water, RO permeate, product-water and electrical interfaces should be reviewed before fabrication and shipment.
Power supplyFeed-water interfaceProduct-water connectionReject / drain connectionEquipment footprintMaintenance clearanceFoundationAmbient conditionsInstallation accessElectrical standard
Request Layout Review 
Manufacturing & FAT
Factory Assembly & FAT
Assembly, inspection and functional review are planned against the approved technical agreement and agreed project scope.
Final FAT scope and acceptance criteria are confirmed in the approved technical agreement.
Related Real Project
View Project Vietnam Lithium Battery Pure Water Project
- Country
- Vietnam
- Industry
- Lithium battery
- System
- Integrated RO + EDI pure-water line
- Application
- Battery production process water
A modular pure-water system configured for an overseas battery manufacturing project, including commissioning coordination and operator support.
Price / Selection Factors
What Determines the Cost of an RO + EDI System?
The quotation follows the source-water treatment basis, high-purity water target, EDI feed conditions and agreed project scope.
FAQ
RO + EDI System Buyer Questions
Direct answers for engineering, procurement and project-planning discussions.
What is the role of RO in an RO + EDI system?+
RO is the primary desalination stage. It reduces dissolved salts and provides the conditioned feed basis reviewed for EDI polishing.
What is the role of EDI?+
EDI continuously removes residual ions from suitable RO permeate. It is a polishing stage, not a replacement for upstream treatment.
Does EDI need RO permeate?+
EDI normally requires correctly conditioned RO permeate. Feed requirements such as hardness, CO₂, silica, conductivity and temperature should be reviewed during engineering.
How does RO + EDI differ from double-pass RO?+
Double-pass RO adds a second desalination stage; RO + EDI adds continuous ionic polishing after suitable RO permeate. The required use-point quality determines which route is appropriate.
Does RO + EDI use conventional acid and alkali regeneration?+
EDI provides continuous deionization without conventional acid/alkali resin regeneration, subject to the approved configuration and operating conditions.
What information is needed for a proposal?+
Send feed-water analysis, capacity, final-water requirement, application, operating hours, country and site conditions.
Related System Comparison
Compare All Water Systems Compare Related Water Systems
| System | Industrial RO | RO + EDI | Ultrapure water |
|---|---|---|---|
| Best for | Process and production water | Stable high-purity water | Critical purity applications |
| Typical route | Pretreatment → RO | Pretreatment → RO → EDI | RO → EDI → polishing stages |
| Polishing | Optional downstream stage | Continuous EDI | Multiple selected stages |
| When to use | RO permeate meets duty | EDI polishing is required | Critical controls are required |
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Start Your Project
Planning an RO + EDI High-Purity Water System?
Share your feed-water analysis, required capacity, target conductivity or resistivity, application and operating profile.
Water analysisRO permeate basisCapacityFinal qualityApplicationOperating hoursCountry