Deionization (DI) & DM Water Plants for Industrial Use
Demineralisation (DM) and deionization (DI) plants for boiler feed, laboratories, pharma and electronics. Mixed bed, two-bed and RO+DI configurations compared.
- Pan-India installation & service
- AMC support available
- Free site water-quality audit
- Custom-engineered to your TDS
- Capacity range
- 25 – 4,000+ LPH
- Indicative capex
- ₹80,000 - ₹25 lakh
- Installation lead time
- 48 – 72 hours
- Annual AMC
- 10 – 14% of capex
Demineralisation removes essentially all ionic content, taking conductivity down to the microsiemens range — far below what RO alone achieves. Boiler feed at higher pressures, laboratory reagent water, pharmaceutical utilities, electronics rinsing and battery manufacturing all require it.
The important commercial insight is configuration. A standalone two-bed DM plant on raw water consumes large volumes of acid and alkali for regeneration, which is expensive, hazardous to handle and generates neutralisation effluent. Putting an RO ahead of the DI removes 95-98% of the ionic load first, so the resin does a fraction of the work and regeneration frequency collapses.
For almost every new installation, RO followed by mixed-bed DI (or electrodeionisation) has a materially lower total cost of ownership than DM alone, even though its capex is higher. Model five-year cost, not purchase price.
Capacity, application & indicative cost
| Configuration | Typical output quality | Best for | Indicative capex |
|---|---|---|---|
| Two-bed DM | < 20 µS/cm | Low-pressure boiler feed | ₹80,000 - ₹4,00,000 |
| Mixed bed DI polisher | < 1 µS/cm | Lab, pharma polishing | ₹1,50,000 - ₹6,00,000 |
| RO + mixed bed DI | < 1 µS/cm, low TOC | Most new installations | ₹4,00,000 - ₹15,00,000 |
| RO + EDI | < 0.1 µS/cm, chemical-free regen | Pharma, electronics | ₹8,00,000 - ₹25,00,000 |
Figures are indicative planning ranges for budgetary approval, not quotations. Actual cost and achievable output depend on your feed-water analysis, materials of construction, automation level, instrumentation, storage and site conditions.
DM vs RO vs RO+DI — choosing correctly
- RO alone — removes 95-98% of dissolved ions. Sufficient for drinking water, most process duty and low-pressure boilers.
- DM alone — reaches lower conductivity than RO, but regeneration chemical consumption on raw water is high and effluent handling is onerous.
- RO + DI — RO does the bulk removal, DI polishes. Lower operating cost, far less regeneration, and the standard modern choice.
- RO + EDI — electrodeionisation regenerates electrically with no acid or alkali. Higher capex, lowest operating burden, preferred for pharma and electronics.
Important
Total cost of ownership, not just capex
Capital cost is usually 30-40% of what a commercial water system costs you over five years. The rest is power, membrane and cartridge replacement, reject water, and labour. Two plants with identical price tags can differ by 60% in five-year TCO.
- Power — energy-efficient pumps and correctly sized motors are the largest controllable operating cost on plants above 500 LPH.
- Recovery ratio — a plant recovering 70% instead of 45% cuts both your feed water bill and your reject disposal volume substantially.
- Membrane life — driven almost entirely by pre-treatment quality and flushing discipline, not by membrane brand.
- Consumables — cartridge filters, antiscalant and salt for softener regeneration, budgeted monthly rather than as surprises.
- AMC and downtime — for a production facility, unplanned downtime usually dwarfs every other line item.
Installation, commissioning and service response
Commercial buyers are buying uptime, so the commercial terms matter as much as the equipment specification. Insist on these being written into the purchase order rather than discussed verbally.
- Site survey and feed-water analysis before the final quotation — never accept a specification produced without a water report.
- Defined commissioning scope: civil and electrical prerequisites, who supplies what, and a documented performance test at handover.
- Written service response times, with escalation, and clarity on whether spares are held locally.
- Operator training and a laminated SOP left on site, so routine flushing and cartridge changes do not depend on one person.
- Warranty terms stated separately for membranes, pumps, vessels and instrumentation, because they differ.
What a quotation includes
- Feed analysis, ionic load calculation and configuration selection
- FRP or rubber-lined vessels with cation, anion or mixed-bed resin
- Regeneration system with acid/alkali handling, or EDI for chemical-free operation
- Online conductivity monitoring with alarm and diversion
- Installation, commissioning and resin performance validation
Why specify with us
Low total cost of ownership
High-rejection membranes, correctly sized pre-treatment and efficient pumps reduce power draw, consumable spend and reject volume. We quote five-year operating cost alongside capex, because that is the number that actually matters.
Heavy-duty SS-304 / SS-316 build
Corrosion-resistant stainless chassis and wetted parts engineered for continuous 24/7 duty, with SS-316 specified where chlorides or process chemistry demand it.
Rapid on-site servicing & AMC
Pan-India installation and service, with written response times and escalation in the AMC rather than verbal assurances — because plant downtime, not the repair, is your real cost.
Custom TDS tuning
Systems engineered against your actual water analysis — brackish groundwater, municipal supply or heavy borewell input, including high-TDS configurations for 3,000+ ppm feed.
Treatment architecture
- 1
Pre-treatment module
Multigrade sand and activated carbon filtration strips suspended solids, turbidity and chlorine that would otherwise oxidise the RO membrane.
- 2
Softening / antiscalant dosing
Protects membranes from calcium and magnesium scaling. On hard feed water this stage is not optional — it determines membrane life.
- 3
High-pressure RO module
Heavy-duty booster pumps drive feed water through industrial spiral-wound membranes at 12-18 bar in an array sized for your recovery target.
- 4
Post-treatment disinfection
UV disinfection and ozonation, with mineral dosing where potable taste and consistency matter.
- 5
Microprocessor / PLC controls
Auto start-stop on tank level, dry-run protection, high and low pressure cut-offs, and timed membrane flushing — with data logging on industrial plants.
Frequently asked questions
What is the difference between DM water and RO water?
What is the cost of a DM plant in India?
What is the typical lead time for commercial installation?
Do you offer Annual Maintenance Contracts (AMC)?
Need a quote for dm / di water systems today?
Share your water analysis report and output requirement, and our technical team will build a system specification with capex, five-year operating cost and AMC options.