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Ion exchange and high-purity water
Ion Exchange and High-Purity Water Systems
Ion exchange removes dissolved ionic species from water using resin beds, producing demineralised water below 1 microsiemens per centimetre. It is specified from the ionic load per cycle — feed conductivity multiplied by throughput — rather than from flow rate alone, which is why identical flow rates can need very different resin volumes.
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Answer first
What Ion Exchange and High-Purity Water Are, and How They Are Specified
Ion exchange removes dissolved ionic species from water using resin beds, producing demineralised water below 1 microsiemens per centimetre. It is specified from the ionic load per cycle — feed conductivity multiplied by throughput — rather than from flow rate alone, which is why identical flow rates can need very different resin volumes.
Ion exchange finishes what reverse osmosis starts. RO does bulk removal at 96 to 99.8 percent; ion exchange takes the remainder down to demineralised quality. Running ion exchange on raw water without RO ahead of it is possible but expensive, because regeneration frequency scales directly with the ionic load arriving.
The choice within the category is mostly about how regeneration happens. A DM plant regenerates in batches with acid and caustic; EDI regenerates continuously with an electric field and no chemicals; a mixed bed polishes to a tighter outlet than a two-bed plant will hold.
Choose a type
Ion Exchange and High-Purity Water by Type
Each type below has its own page with a full specification table, selection guidance and its own enquiry route.
DM Water Plants
DM water plants remove dissolved ionic species using strong acid cation and strong base anion resin beds, producing demineralised water below 1 microsiemens per centimetre.
DI Water Systems
DI water systems remove ionic species using cartridge or cylinder-exchange resin, producing deionised water without on-site acid and caustic handling.
EDI Systems
EDI systems combine ion exchange resin with ion-selective membranes and an applied electric field, so the resin is regenerated continuously rather than in batches.
Mixed Bed Systems
Mixed bed systems combine cation and anion resin intimately in a single vessel, so the water passes through many alternating exchange sites in series.
Ion Exchange Resins
Ion exchange resins are polymer beads carrying fixed functional groups that exchange ions with the water passing over them.
Specification
Process comparison
| System | Typical output | Regeneration | Chosen for |
|---|---|---|---|
| DM water plant | Below 1 µS/cm | Batch, acid and caustic | Bulk demineralised water where chemical handling is acceptable |
| DI system | Below 1 µS/cm | Cartridge or cylinder exchange | Lower volumes and laboratory duty |
| EDI system | 1–17 MΩ·cm | Continuous, electrical | Continuous high purity without regeneration chemicals |
| Mixed bed | Up to 18.2 MΩ·cm | Batch or cartridge exchange | Final polishing beyond what a two-bed plant holds |
| Ion exchange resin | Media only | Depends on the vessel it serves | Replacement media for existing plant |
DM water plant
- Typical output
- Below 1 µS/cm
- Regeneration
- Batch, acid and caustic
- Chosen for
- Bulk demineralised water where chemical handling is acceptable
DI system
- Typical output
- Below 1 µS/cm
- Regeneration
- Cartridge or cylinder exchange
- Chosen for
- Lower volumes and laboratory duty
EDI system
- Typical output
- 1–17 MΩ·cm
- Regeneration
- Continuous, electrical
- Chosen for
- Continuous high purity without regeneration chemicals
Mixed bed
- Typical output
- Up to 18.2 MΩ·cm
- Regeneration
- Batch or cartridge exchange
- Chosen for
- Final polishing beyond what a two-bed plant holds
Ion exchange resin
- Typical output
- Media only
- Regeneration
- Depends on the vessel it serves
- Chosen for
- Replacement media for existing plant
Typical output bands. Achievable quality depends on the feed and the configuration, and follows the datasheet of the system quoted.
Selection guidance
Size on ionic load per cycle, not on flow rate
The question a resin volume answers is how many ions it must capture between regenerations, and that is feed conductivity multiplied by volume treated. Two plants both rated at 10 m³/h can differ by a factor of five in resin volume if one runs on RO permeate at 10 µS/cm and the other on softened raw water at 400 µS/cm.
This is why putting RO ahead of ion exchange usually pays for itself. Cutting the ionic load by two orders of magnitude cuts regeneration frequency in proportion — which means less acid, less caustic, less neutralisation effluent and less downtime.
Application mapping
Where Ion Exchange and High-Purity Water Are Used
Boiler feed water
- Typical requirement
- Very low conductivity and silica
- Indicated configuration
- RO, then EDI, then a mixed bed polisher with silica monitored on the outlet
Pharmaceutical purified water
- Typical requirement
- Compendial conductivity limit
- Indicated configuration
- Softener, RO, EDI, distribution loop
Chemical and ethanol process make-up
- Typical requirement
- DM water against high silica feed
- Indicated configuration
- Two-stage RO then mixed bed, or DM plant with a degasser
Laboratory Type II supply
- Typical requirement
- General analytical water
- Indicated configuration
- RO with DI polishing sized on laboratory throughput
Commercial terms
How This Category Is Quoted
Water treatment does not have a list price, and any supplier quoting one before seeing a feed analysis is quoting a different plant from the one you need.
Pricing basis
On request, and capacity-dependent. Plant pricing moves with capacity, feed water analysis and the recovery target; membranes, cartridges and resins are quoted per element, per lot or per litre of media.
Order quantity
From a single replacement element or a case of cartridges through to full plant scope. Consumable lines are quoted per box or per lot, and the lot size is stated on the quotation.
Lead time
Confirmed per line item at quotation stage. Stocked consumable lines and made-to-order plant differ substantially, so a single blanket lead time for the category would be misleading — the quotation carries the figure for each line.
Invoicing
GST invoice against company or institutional purchase order. Proforma issued where advance payment or internal approval requires it.
Delivery coverage
Despatch from Delhi NCR across India, including plant, project and institutional sites. Delivery city and site access are asked for at enquiry because both affect despatch mode.
Documentation
Technical datasheet for the item quoted, and a test certificate where the principal supplies one with that product. Tender and institutional documentation formats are prepared on request — send the format with the enquiry so the quotation is issued in a form you can submit without rework.
Request for quotation
Request a Quote — Ion Exchange and High-Purity Water
Fields marked with an asterisk are required. The technical fields are what usually decide whether you get a quotation on the first pass or three emails of clarification.
Frequently asked
Ion Exchange and High-Purity Water — Common Questions
What is the difference between DM water and DI water?
In practice the terms overlap. Demineralised usually describes a plant-scale process with regenerable resin beds, while deionised more often describes cartridge or cylinder-exchange systems at lower volumes.
Both remove ionic species to a similar outlet quality. Neither removes non-ionic organics, particulates or micro-organisms, which is why polishing stages are added where those matter.
Should I choose a DM plant or an EDI system?
EDI where continuous high-purity water is needed and designing out acid and caustic handling is worth paying for. A DM plant where the volume is large, the feed is variable, or chemical regeneration is already established on site.
EDI is less tolerant of its feed — hardness, chlorine and organics must be removed upstream, which in practice means it is fed by RO permeate.
Does ion exchange remove bacteria or organics?
No. Ion exchange acts on ionic species. Non-ionic organics, particulates and micro-organisms pass through, and resin beds can themselves support biological growth if left stagnant.
Where those matter, UV, ultrafiltration or a final filter is added after the ion exchange stage rather than instead of it.
Related Products and Categories
Specified alongside ion exchange and high-purity water, and the category this page sits in.
Industrial RO systems upstreamLaboratory water systems for Type I and IIWater analyzers for conductivity and silicaBack to Water Purification Systems
- Delhi NCR base with pan-India supply, including plant and project sites.