A DM plant produces ultra-pure water by stripping out every dissolved ionic species — calcium, magnesium, sodium, chlorides, sulphates, silica — through ion-exchange resins. Where your application demands conductivity below 1 μS/cm and silica below 20 ppb — boiler feed for a power plant, WFI feed for pharma, ultra-pure water for semiconductors — DM is the only technology that gets you there.
Reverse osmosis is excellent at bulk salt removal — it'll take a 1500 ppm TDS feed and give you 30 ppm permeate, comfortably. But for applications that need conductivity below 1 microsiemen, RO alone won't get there. The remaining 30 ppm of dissolved species is still 30,000 times what a high-pressure boiler will tolerate.
DM uses ion-exchange resins to capture those last traces. Cation resins exchange positively-charged ions (Ca, Mg, Na) for hydrogen. Anion resins exchange negatively-charged ions (Cl, SO₄, HCO₃, SiO₂) for hydroxide. The hydrogen and hydroxide combine into water — and the result is conductivity that approaches the theoretical limit of pure water itself.
Modern alternatives — Electro-Deionisation (EDI) paired with RO — eliminate the chemical regeneration that classical DM requires. We design either approach depending on your duty profile, regeneration tolerance and operating philosophy.
Classical configuration with chemical regeneration. Reliable, well-understood, ideal for boiler-feed duty where occasional regeneration downtime is acceptable.
Cation and anion resins co-mingled in a single vessel for ultimate polishing. Used after two-bed DM or RO for the highest purity.
Electrodeionisation paired with RO — no chemical regeneration, continuous operation, increasingly the preferred path for new pharma installations.
Pre-treatment to a downstream still or distillation system producing Water for Injection. SS316L wetted parts, validation-grade documentation.
For thermal power plants, captive industrial boilers, and process steam generation — meeting IBR / OEM specifications.
Ultra-pure water for wafer washing, PCB rinsing and cleanroom-grade applications.
Pure feed water for batch and continuous chemical reactors — where ionic contamination affects product quality.
Type-I, Type-II and Type-III lab water generation for pathology, R&D and quality-control laboratories.
Formulation-grade water meeting BIS specifications for FMCG and personal-care manufacturers.