IONPURE VNX55EP-2 Replacement EDI Module
CM VNS-MAX / 15 m³/h High-Flow CEDI Module
An independent alternative for IONPURE / Xylem PW-VNX55EP-2 installations. Designed for industrial high-purity water systems, with simplified hydraulics and project-specific retrofit assessment.
CM MODEL
VNS-MAX
15m³/h
Nominal Product Flow
>17MΩ·cm
RO-Feed Resistivity*
0-300V
DC Voltage Range
3Years
Standard Warranty
*Under applicable feedwater and operating conditions.
PRODUCT OVERVIEW
A practical alternative for high-flow EDI replacement projects
The CM VNS-MAX is a 15 m³/h continuous electrodeionization module designed for high-purity water polishing and EDI system integration. It is positioned as an independent alternative for selected IONPURE / Xylem VNX55EP-2 installations.
Replacement selection involves more than matching nominal flow. Mechanical dimensions, hydraulic capacity, connection layout, DC power characteristics and feedwater quality must all be reviewed before installation.
WHY VNS-MAX
Built for high-flow output. Designed for simpler integration.
Six product characteristics worth evaluating when selecting an EDI module for new projects or industrial equipment replacement.
15 m³/h high-flow output
A higher nominal capacity per module can simplify large-system configurations when the full hydraulic design permits.
High-purity water polishing
Published product resistivity above 17 MΩ·cm with suitable RO permeate feed; actual performance is condition-dependent.
Simplified hydraulic design
No salt dosing, no concentrate recirculation and no separate electrode-water discharge required.
Fully resin-filled chambers
Both dilute and concentrate chambers use resin filling to support electrical conduction and ion transport.
Compact module integration
An RO-style FRP housing and two-inlet/two-outlet configuration support new-system design and retrofit evaluation.
3-year standard warranty
Supplied with a standard three-year warranty subject to the applicable terms and operating requirements.
TECHNICAL COMPARISON
IONPURE VNX55EP-2 vs. CM VNS-MAX
An initial side-by-side reference for technical buyers. Confirm actual original equipment revisions and the VNS-MAX operating envelope before any replacement approval.
| Specification | IONPURE / Xylem Original reference | CM VNS-MAX Independent alternative |
|---|---|---|
| Manufacturer | IONPURE / Xylem | Shanghai CM |
| Product model | IP-VNX55EP-2 (original reference) | VNS-MAX |
| Technology | Continuous electrodeionization | Continuous electrodeionization |
| Nominal product flow | 12.5 m³/h | 15 m³/h |
| Product resistivity | Typically >17 MΩ·cm | >17 MΩ·cm (RO feed)* |
| DC voltage | 0-300 VDC | 0-300 VDC |
| DC current | 2-13.2 A | 0-6 A |
| Recovery | Up to 95% (conditions apply) | Project-specific; verify |
| Connection | Verify against existing module | 1.5 in. ANSI socket, SCH 80 PVC |
| Dimensions & mounting | Reference existing drawing | Confirm with CM drawing |
| Warranty | Refer to original manufacturer | 3 years (standard) |
Compatibility note: The two modules have different published DC current requirements. Equal voltage ranges and comparable nominal product flow do not establish electrical, mechanical or hydraulic interchangeability. Original figures are reference data; CM figures come from the VNS-MAX datasheet.
* CM resistivity with suitable RO feed. Original model specifications are drawn from published technical references and may vary by revision. Dimensions, pressure limits, recovery and port locations require project-level verification.
VNS-MAX DATA SHEET
Technical specifications
Detailed module-level specifications from the CM VNS-MAX product datasheet.
Performance & electrical
| Model | VNS-MAX |
|---|---|
| Product type | High-Flow Continuous Electrodeionization (CEDI) |
| Nominal product flow | 15 m³/h |
| Product resistivity, RO feed | >17 MΩ·cm |
| Product resistivity, DI feed | >18 MΩ·cm |
| DC voltage | 0-300 V |
| DC current | 0-6 A |
| Standard warranty | 3 years |
Operating data require confirmation
Feedwater limits, operating pressure, pressure drop, recovery and dimensional drawings are not specified in the supplied VNS-MAX datasheet. Confirm these before order placement.
Construction & hydraulic
| Working principle | Ion-exchange membranes + mixed-bed resin |
|---|---|
| Membrane material | Acid-resistant ion-exchange membranes |
| Resin | Imported ion-exchange resin |
| Electrodes | Pt-coated titanium |
| Dilute / concentrate chambers | Both fully resin-filled |
| Flow arrangement | Two inlets / two outlets; co-current |
| Process connection | 1.5 in. ANSI socket, SCH 80 PVC |
| Conversion adapters | Included / available |
System configuration
| Salt dosing | Not required |
|---|---|
| Concentrate recirculation | Not required |
| Separate electrode-water discharge | Not required |
| Housing | FRP |
| Nominal design flow | 15 m³/h |
| Feedwater acceptance criteria | Confirm for project |
| Recovery and pressure limits | Confirm for project |
ENGINEERING DESIGN
Inside the VNS-MAX high-flow module
The VNS-MAX design combines ion-exchange membranes, mixed-bed resin, platinum-coated titanium electrodes and a compact FRP housing.
Disc-type flow distribution
Disc-shaped distributor components and multiple sealing points are intended to support hydraulic distribution and leak control.
Optimized electrical conduction
Low-resistance ion-exchange membranes and resin-filled chambers are designed to support efficient current utilization.
Two sub-stacks, one housing
The high-flow architecture allows two sub-stacks to be integrated within a single FRP housing.
RETROFIT COMPATIBILITY
What engineers should verify before replacing an EDI module
Mechanical, hydraulic, electrical and feedwater compatibility are essential. VNS-MAX should be selected only after review of the complete system.
Mechanical fit
Overall envelope, orientation, mounting, service clearances and module support.
Pipe connections
Four port positions, pipe size, orientation and any required conversion adapters.
Hydraulic operating window
Product flow, inlet pressure, differential pressure, concentrate flow and recovery.
Electrical & controls
Rectifier output, operating current, control logic, interlocks and startup sequencing.
Feedwater quality
Conductivity, hardness, silica, CO₂, TOC, pH and temperature.
Need to confirm a replacement fit?
Share the existing nameplate, dimensional drawing, operating flow and DC settings for a technical review.
INDUSTRIAL APPLICATIONS
Where VNS-MAX fits
VNS-MAX is intended for industrial high-purity water applications using appropriately pretreated feedwater.
APPLICATION 01
Power plant boiler feedwater
High-purity makeup water polishing downstream of suitable RO pretreatment for power and steam generation systems.
APPLICATION 02
Industrial high-purity process water
Continuous low-conductivity water production for manufacturing processes with stringent ionic quality requirements.
APPLICATION 03
RO + EDI water treatment systems
An EDI polishing stage for properly engineered reverse osmosis systems and new integrated water treatment skids.
TYPICAL PROCESS CONFIGURATION
Illustrative process only. Pretreatment and final polishing requirements vary by project.
REPLACEMENT WORKFLOW
From existing module to a reviewed replacement solution
A clear technical selection process helps reduce retrofit uncertainty and supports faster procurement decisions.
Identify the existing module
Send the original nameplate and photos. Confirm the exact PW/IP-VNX55EP-2 designation and revision.
Share the operating data
Provide flow, product quality, feedwater analysis, DC settings and available piping drawings.
Review the retrofit fit
Check mechanical, hydraulic and electrical requirements; identify modifications, if any.
Confirm the supply plan
Agree on the selected configuration, quantity, required documents and delivery requirements.
ABOUT SHANGHAI CM
A manufacturing partner for industrial membrane solutions
Shanghai CM Environmental Technology Co., Ltd. supplies membrane products, EDI modules and industrial water treatment equipment for international engineering and B2B projects.
Technical selection based on flow, water quality and integration requirements.
Broader RO, UF, MBR and industrial water treatment product portfolio.
Support for international procurement and project documentation.
VNS-MAX three-year standard warranty, subject to warranty conditions.
TECHNICAL DOCUMENTS
VNS-MAX Product Data Sheet
Module specifications, construction, connection details and retrofit notes. The download link is a placeholder until your PDF is uploaded to WordPress.
FREQUENTLY ASKED QUESTIONS
Questions from technical buyers
Answers focused on replacement compatibility, performance and procurement.
Have an unusual retrofit configuration?
Send your nameplate and operating conditions for engineering assessment.
Ask CMCan CM VNS-MAX replace an IONPURE PW-VNX55EP-2 module?
VNS-MAX is offered as an independent replacement alternative for evaluation. Direct compatibility is not guaranteed. The existing module nameplate, dimensions, port layout, hydraulic operating requirements, electrical supply and feedwater conditions must be reviewed before confirmation.
Is it a direct drop-in replacement?
Not necessarily. A retrofit assessment may identify changes to piping, mounting, electrical components or controls. Conversion adapters are included or available, but they do not by themselves establish direct-fit compatibility.
What is the nominal production capacity of VNS-MAX?
The published nominal product flow is 15 m³/h per module. The actual operating window and achievable production under your water quality requirements must be confirmed during technical selection.
Can VNS-MAX achieve product resistivity above 17 MΩ·cm?
The CM datasheet specifies >17 MΩ·cm with suitable RO permeate feed and >18 MΩ·cm with DI water feed. Actual performance depends on feedwater composition, temperature, flow and electrical settings.
Can the existing IONPURE DC power supply be reused?
It must be evaluated. The published VNS-MAX range is 0-300 VDC and 0-6 A; the original VNX55EP-2 reference has a different current range. Verify rectifier output, operating settings, interlocks and control compatibility before using an existing supply.
Does VNS-MAX need salt dosing or concentrate recirculation?
According to the CM datasheet, neither salt dosing nor concentrate recirculation is required, and a separate electrode-water discharge is not required. A concentrate/reject outlet remains part of the hydraulic circuit and must be correctly connected.
Which process connections does VNS-MAX use?
The listed process connection is a 1.5-inch ANSI socket in SCH 80 PVC. There are two inlets and two outlets in a co-current arrangement. Exact port positions should be checked using the installation drawing.
What information is needed for a replacement quotation?
Please send the original model number and nameplate photo, quantity, product flow and quality requirement, feedwater data, DC power supply information, installation dimensions and destination country.
How long is the standard warranty?
The VNS-MAX product datasheet states a standard three-year warranty. Request the full coverage conditions and exclusions with the quotation.
ENGINEERING & PROCUREMENT SUPPORT
Request a VNX55EP-2 replacement quote
Share the original module details and required operating conditions. CM can review the information and help you evaluate VNS-MAX for your project.
Existing module model and quantity
Product flow, resistivity and feedwater analysis
DC power, dimensions and piping arrangement
Tell us about your replacement project
Fields marked * are required. We'll respond within 24 hours.
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Trademark disclaimer: IONPURE® and Xylem® are trademarks of their respective owners. Shanghai CM Environmental Technology Co., Ltd. is an independent manufacturer and is not affiliated with or endorsed by Xylem. Original model references are used solely for equipment identification and compatibility evaluation. Compatibility must be independently verified for each installation.