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Optima Water Solutions supplies and installs Electrodeionization (EDI) Systems in Darjeeling for ultrapure water production used in pharmaceutical, semiconductor, power, and high-purity chemical manufacturing. Our ISO 9001:2015 certified EDI systems eliminate the need for chemical regeneration, producing consistently high-purity water (resistivity 10–18 MΩ·cm) with minimal environmental impact.
What is a EDI Systems?
Electrodeionization (EDI) is a continuous electrochemical ion exchange process that uses ion exchange membranes, resins, and a DC electric current to remove dissolved ionics from water — producing ultrapure water without the chemical regeneration required by conventional ion exchange (DM plant) systems.
EDI operates as a polishing step after Reverse Osmosis (RO) to produce high-purity water meeting USP Purified Water, ASTM Type I/II, and semiconductor grade specifications. Output water typically has resistivity of 10–18 MΩ·cm and TDS below 0.1 ppm.
Key advantages over conventional DM plants: no acid/alkali regeneration chemicals, continuous 24/7 operation, consistent output quality, and lower hazardous waste.
EDI Systems in Darjeeling — Why It Matters
Facilities operating near Siliguri Industrial Growth Centre (nearest industrial hub) in Darjeeling face close scrutiny over wastewater discharge. WBPCB requires STP compliance for hospitality and institutional projects given Darjeeling's ecologically sensitive hill-station status.
Optima Water Solutions has built a track record of EDI installations serving Darjeeling and the surrounding area, with local support for commissioning, operator training, and ongoing maintenance.
Key industrial areas we serve in Darjeeling:
Regulatory Note: WBPCB requires STP compliance for hospitality and institutional projects given Darjeeling's ecologically sensitive hill-station status.
Our 4-Step Process — From Design to Handover
1
Feed Water Analysis
RO permeate quality analysis — conductivity, silica, CO2. EDI module selection and stack design.
2
System Engineering
EDI module array design. Pre-treatment requirements — degasser, polisher. Control system design.
3
Supply & Integration
EDI modules from leading manufacturers (SnowPure, Siemens, GE). Integration with existing RO system.
4
Commissioning & Validation
Performance qualification (PQ). USP/ASTM water quality testing. IQ/OQ/PQ documentation for pharma clients.
Why Choose Optima Water Solutions
- Chemical-free operation — no acid, caustic, or salt regeneration required
- Continuous 24/7 operation — no downtime for regeneration cycles
- Consistent ultrapure water quality — resistivity 10–18 MΩ·cm
- USP Purified Water and WFI-grade output for pharmaceutical applications
- Lower lifecycle cost than conventional DM plant with chemical costs eliminated
- Safe operation — no chemical handling, storage, or neutralisation pit required
- Compact installation — modular EDI stacks, small footprint
- SCADA integration — continuous quality monitoring, alerts
- IQ/OQ/PQ validation documentation for GMP pharmaceutical facilities
- AMC and module replacement services available in {city}
Industries & Applications in Darjeeling
Pharmaceutical (USP PW)
Semiconductor Mfg
Power Plant Boiler
Electronics Mfg
Laboratory Water
Chemical Manufacturing
Solar Cell Production
Medical Devices
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Common Questions
EDI Systems in Darjeeling — FAQ
What is the cost of an EDI System in Darjeeling?
EDI system cost in Darjeeling depends on capacity and application. A 100 LPH pharmaceutical EDI system starts from ₹5–8 Lakh. A 1 m³/hr industrial EDI costs ₹15–25 Lakh. Large 10 m³/hr systems for power or semiconductor use range ₹80 Lakh to ₹2 Crore. Call +91 9711880791 for specifications and pricing.
What is the difference between EDI and DM Plant?
A DM (Demineralisation) plant uses cation and anion exchange resins regenerated periodically with HCl and NaOH. EDI uses continuous electrochemical regeneration — no chemicals needed, no downtime for regeneration, consistent output quality. EDI produces higher purity water (10–18 MΩ·cm vs 1–5 MΩ·cm for DM) with lower long-term operating costs.
Does EDI meet USP Purified Water requirements?
Yes. A properly designed RO + EDI system consistently meets USP Purified Water specifications — conductivity below 1.3 µS/cm at 25°C, TOC below 500 ppb, and microbial limits. Optima provides full IQ/OQ/PQ validation documentation for pharmaceutical EDI installations in Darjeeling.
What pre-treatment does EDI require?
EDI requires RO permeate as feedwater — typically RO output with conductivity below 30 µS/cm. Free chlorine must be absent (use activated carbon or sodium bisulphite dosing). CO2 should be removed using a degasser. Hardness must be below 1 ppm. Proper pre-treatment ensures EDI module life exceeds 5–7 years.
Can you retrofit EDI to an existing RO system in Darjeeling?
Yes. If you have an existing RO system in Darjeeling, Optima can add an EDI polishing module to upgrade output water quality to ultrapure standards. We assess your existing RO output quality and design the EDI integration — including any additional pre-treatment needed before the EDI module.
Ready to Start?
Our engineers in Darjeeling are available for a free site visit and assessment.