IONPURE VNX-CDIT High Flow Electrodeionization CEDI Module 30 GPM 6.8 m³/h for Industrial Ultrapure Water Purification System

　　Ionpure VNX-CDIT is a CEDI(continuous electrodeionization)module engineered for ultrapure water purification systems using single-pass reverse osmosis permeate.It tolerates up to 4 ppm feed hardness(as CaCO₃)and 2 ppm silica,while producing>16 MΩ·cm water at 80–90%recovery without hazardous chemical regeneration.Available in two flow capacities—the IP-VNX30CDIT-2 at 6.8 m³/h(30 gpm)and the IP-VNX15CDIT-2 at 3.4 m³/h(15 gpm)—it serves power generation,general electronics,and pharmaceutical pretreatment.

　　What Is a CEDI Module?

　　A CEDI module is an electrochemical water purification device that continuously removes ionized and weakly ionized contaminants from reverse osmosis permeate by combining ion-exchange resins,ion-selective membranes,and a DC electric potential.It replaces conventional mixed-bed ion exchange polishers,eliminating the need for chemicals used in regeneration.

　　CEDI modules are generally divided into two categories:high-purity polishing modules that follow double-pass RO and require very low feed hardness,and hardness-tolerant modules designed to operate directly on single-pass RO permeate.The VNX-CDIT series falls into the second category—it utilizes thin-cell technology and enhanced CO₂removal to handle feed water with up to 4 ppm total hardness and 2 ppm silica,making it viable where double-pass RO or softening is not economical.

　　Key Specifications

　　Nominal Product Flow(VNX30-CDIT/IP-VNX30CDIT-2):6.8 m³/h(30 gpm)

　　Nominal Product Flow(VNX15-CDIT/IP-VNX15CDIT-2):3.4 m³/h(15 gpm)

　　Product Water Resistivity:>16 MΩ·cm

　　Silica(SiO₂)Removal:≥95%

　　Sulfate(SO₄²⁻)Removal:≥95%

　　Water Recovery:80–90%

　　Maximum Feed Conductivity:<100µS/cm

　　Maximum Feed Hardness(as CaCO₃):4.0 ppm

　　Maximum Feed Silica(SiO₂):2.0 ppm

　　Enhanced CO₂Removal:Yes(thin-cell design optimized for dissolved carbon dioxide)

　　Feed Water Pressure Range:1.4–7 bar(20–100 psi)

　　Feed Water Temperature Range:5–45°C(41–113°F)

　　Maximum Ambient Temperature:45°C(113°F)

　　Residual Free Chlorine Tolerance:<0.02 ppm(as Cl₂)

　　Operating Voltage:0–600 VDC

　　Sealing Technology:Through-port gasket with double O-ring

　　Module Dimensions(VNX30-CDIT):44.45 cm×50.8 cm×50.8 cm×213.3 cm(Diameter×Width×Height×Length)

　　Module Dimensions(VNX15-CDIT):44.45 cm×50.8 cm×50.8 cm×101.6 cm

　　Connections:Flanged,material per project specification

　　Certifications:CE Marked,ISO 9001:2015,ISO 14001:2015,Halal certified

　　Technical Highlights

　　Hardness tolerance of 4 ppm allows direct single-pass RO feed.Standard CEDI modules demand feed hardness below 1 ppm,often compelling users to install dual-pass RO or softening.The VNX-CDIT’s thin-cell construction and specially formulated mixed-bed resin tolerate up to 4 ppm total hardness,eliminating one entire RO stage or softening step.This directly answers whether the module can run on single-pass RO—it is specifically designed for this.

　　Enhanced CO₂removal reduces downstream polishing load.The thin-cell design intensifies the electric field gradient across the dilute compartments,driving dissolved CO₂gas conversion to bicarbonate and then its migration into concentrate channels.A common question is how much CO₂can be removed—the VNX-CDIT achieves≥90%CO₂reduction from typical RO permeate,which prevents the weak-acid loading that destabilizes product resistivity.

　　Modular dual-flow selection simplifies system design.With two nominal capacities—15 gpm and 30 gpm—the VNX-CDIT series allows designers to match hydraulic demand precisely without oversizing.Parallel configurations scale to>228 m³/h(1,000 gpm)using identical module types,reducing spares inventory and maintenance training.

　　Chemical-free operation cuts operating costs.No acid,caustic soda,or neutralization chemicals are required.There is no mixed-bed resin change-out,no regeneration waste stream to treat,and the water recovery of 80–90%is comparable to or better than that of dual-bed ion exchange while eliminating hazardous material handling.

　　Quick-connect power wiring through the factory-installed junction box.Each VNX-CDIT module includes an integrated,pre-wired junction box with a power cable,reducing field wiring time and preventing phase-reversal errors that can damage cell pairs.

　　Applications

　　Single-pass RO polishing for power plant boiler makeup:Produces>16 MΩ·cm water directly from single-pass RO permeate,replacing mixed-bed ion exchange.The ability to accept 4 ppm feed hardness permits the use of simple RO pretreatment,lowering both capital cost and operating workload in gas-fired and coal-fired power stations.

　　General electronics and PCB manufacturing rinse water:Delivers consistent ultrapure water for printed circuit board fabs and component washing lines where 16–18 MΩ·cm quality is sufficient and silica limits are not at semiconductor-grade levels.The CO₂removal capability stabilizes resistivity in storage tanks.

　　Pharmaceutical purified water generation:Operates as a continuous deionization stage following RO,delivering water that meets USP Purified Water conductivity standards without the cyclic quality variation typical of regenerable ion exchange.The halal certification is documented for excipient water and cleaning applications in halal-certified facilities.

　　Food and beverage ingredient water:Provides high-quality water for juice reconstitution,dairy processing,and brewery makeup where assurance of no chemical regrowth or amine carryover is required.Halal certification supports compliance with food safety system audits.

　　Central ultrapure water loop for industrial parks:Multiple VNX30-CDIT or VNX15-CDIT modules,piped in parallel,supply up to several hundred cubic meters per hour of polished water to multiple tenants across a campus,with centralized monitoring and zero on-site chemical regeneration.

　　Replacement of aging mixed-bed ion exchange systems:Retrofitting a regeneration-dependent mixed-bed train with VNX-CDIT modules eliminates acid/caustic handling,extends run length between service interruptions,and reduces wastewater discharge volume,often qualifying for water conservation credits.

　　Selection Guidance

　　Suitable applications:

　　Feed water originating from a properly operated single-pass RO system with conductivity<100µS/cm,hardness consistently at or below 4.0 ppm,and silica≤2.0 ppm

　　Projects where installation and operating cost reduction is a priority and product resistivity of>16 MΩ·cm satisfies the process requirement—typical for most power generation,general electronics,and pharmaceutical purified water loops

　　Facilities lacking space or permits for bulk acid and caustic storage,neutralization pits,or mixed-bed regeneration stations

　　Systems requiring halal-certified water purification equipment for food,beverage,or halal pharmaceutical production

　　Not recommended for:

　　Semiconductor front-end or advanced microelectronics fabs requiring strictly 18 MΩ·cm product water with sub-ppb boron and silica.For those polishing loops,select the Ionpure VNX55-EX,which guarantees 18 MΩ·cm and>99%boron rejection.

　　Feed water where free chlorine exceeds 0.02 ppm continuously.Polymeric membranes and ion-exchange resins are subject to oxidative degradation.Install a sodium bisulfite dosing skid or granular activated carbon filter upstream,or if chlorine is unavoidable,verify whether a chloramine-tolerant pretreatment scheme can be validated.

　　Extremely low-temperature feed water below 5°C because ion mobility and resin kinetics slow sufficiently to reduce achievable product resistivity.Where cold source water is the only supply,a plate heat exchanger to maintain temperature above 15°C is required before the module.

　　Flows below 1.5 m³/h.Operating the smallest VNX15-CDIT module at less than 50%of nominal flow may lead to insufficient turbulence inside dilute cells and localized scaling.For low-flow applications,consider a smaller Ionpure LX series or point-of-use CEDI module.

　　FAQ

　　1.What is the difference between the VNX30-CDIT and VNX15-CDIT,and how do I select the right size?

　　The VNX30-CDIT(IP-VNX30CDIT-2)delivers 6.8 m³/h(30 gpm)nominal product flow,while the VNX15-CDIT(IP-VNX15CDIT-2)delivers 3.4 m³/h(15 gpm).They share identical hardness tolerance,product water quality,and recovery range.Select the size based on the plant’s average daily polished water demand,then add 10–15%margin.For ultrapure water loops exceeding 20 m³/h,multiple VNX30-CDIT modules in parallel typically offer a lower installed cost per cubic meter.

　　2.Can the VNX-CDIT module reliably produce high-purity water directly from single-pass RO permeate,even with 4 ppm hardness?

　　Yes.The thin-cell design and optimized mixed-bed resin in the VNX-CDIT module are specifically validated to accept feed hardness up to 4.0 ppm(as CaCO₃)and silica up to 2.0 ppm while maintaining a product resistivity above 16 MΩ·cm.Under typical single-pass RO permeate conditions of 20–60µS/cm conductivity,product resistivity consistently reaches 17–18 MΩ·cm.We recommend verifying feed hardness trends before committing to single-pass RO feed.

　　3.How much silica and CO₂does the VNX-CDIT remove compared to standard EDI modules?

　　The VNX-CDIT provides≥95%silica removal from feed concentrations up to 2 ppm.Its thin-cell electrodes concentrate electrical potential across a short migration path,which drives dissolved CO₂conversion to bicarbonate and ion transfer into the concentrate channel.In most installations with RO permeate containing 5–15 ppm CO₂,the module removes more than 90%of the CO₂,preventing the product water resistivity drop that occurs in standard EDI modules when CO₂is not removed upstream.

　　4.What are the typical operating costs per cubic meter of product water for the VNX-CDIT,and how does that compare with mixed-bed deionizers?

　　Electricity consumption for the VNX-CDIT module is approximately 0.15–0.35 kWh per cubic meter of product water,depending on feed conductivity.There are zero chemical costs and no regeneration labor.In a typical 20 m³/h polishing loop,this results in a total operating cost below USD 0.03 per cubic meter,compared to USD 0.08–0.15 per cubic meter for on-site regenerated mixed-bed systems that require acid,caustic,neutralization,and resin replacement.

　　5.What pretreatment equipment is absolutely necessary upstream of the VNX-CDIT?

　　A single-pass reverse osmosis system producing permeate with conductivity<100µS/cm and free chlorine<0.02 ppm is the minimum pretreatment.If the raw water supply has fluctuating hardness or silica peaks that may exceed the module’s limits,a softening system or anti-scalant dosing is recommended.A 5-micron cartridge filter immediately before the module prevents particulate fouling.

　　6.What are the dimensions and weight of the VNX30-CDIT and VNX15-CDIT?

　　The VNX30-CDIT measures 44.45 cm in diameter,50.8 cm wide,50.8 cm high,and 213.3 cm long.The VNX15-CDIT shares the same diameter,width,and height but is 101.6 cm long.We supply detailed installation drawings and recommend a clearance of at least 60 cm on all sides for connection and service access.

　　7.Does the VNX-CDIT hold halal certification,and what does that mean for food and beverage applications?

　　The VNX-CDIT module holds a valid halal certificate issued by a recognized certification body.Halal certification confirms that materials and manufacturing processes avoid substances prohibited under Islamic law,which is critical for ingredient water used in halal-certified food,beverage,and pharmaceutical plants.We provide the certificate and support documentation with each shipment.

　　8.How much does the VNX-CDIT cost,and what factors affect the price?

　　Pricing for the VNX-CDIT series typically ranges from 20,000to38,000 USD per module,depending on the flow model,quantity,and project-specific configuration requirements.Prices fluctuate due to exchange rates,tariffs,and factory adjustments.For an accurate quotation with current lead time and shipping terms,contact Beijing Zhongping Technology directly.

　　9.What is the delivery time for the VNX-CDIT series?

　　Standard ex-works lead time is 8 to 10 weeks for both the VNX30-CDIT and VNX15-CDIT.Expedited production slots may reduce lead time to 5–6 weeks for urgent project timelines.Regional stock availability can further shorten delivery to 2–3 weeks through Beijing Zhongping Technology’s distribution network.

　　10.What payment terms and warranty are offered when purchasing VNX-CDIT modules?

　　We accept wire transfer(T/T)and irrevocable letter of credit at sight.For qualified corporate accounts,Beijing Zhongping Technology structures milestone payment schedules aligned with project milestones.The standard factory warranty covers defects in materials and workmanship for 24 months from shipment or 18 months from commissioning,whichever occurs first.An extended warranty of up to 36 months is available at an additional cost.