The global deionized water system market is valued at $7.6 billion in 2025 and is projected to grow to $12.35 billion by 2032, representing a compound annual growth rate (CAGR) of 7.2%. Key players in this market include Veolia Water Technologies (through its ELGA LabWater division), SUEZ Water Technologies & Solutions, Evoqua Water Technologies, Merck Millipore (Milli-Q series), and the former GE Water (now part of SUEZ). Additionally, Pentair, Culligan, Pall Corporation, and Siemens are deionized water manufacturers worth noting. These manufacturers serve four core industries: semiconductors, pharmaceuticals, power generation, and laboratories. Semiconductor wafer cleaning requires deionized water with a resistivity of ≥18.2 MΩ·cm; the pharmaceutical industry must comply with the USP <1231> standard; and boiler feedwater in the power generation sector must adhere to the IAPWS standard.
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Veolia / ELGA: ELGA LabWater is Veolia’s laboratory-grade pure water division. Its CENTRA series of central pure water systems delivers a flow rate of up to 120 L/h, while the PURELAB Chorus 2+ EDI is suitable for large-scale, high-purity water requirements. Its strengths lie in its deep expertise in the laboratory sector and its “Water-as-a-Service” subscription model; its weakness is a relatively limited product lineup for large-scale industrial systems.
SUEZ: Having inherited the E-Cell EDI module technology from the former GE Water, the MK-3 model delivers a water production rate of 3.4 metric tons per hour, with a resistivity of ≥16 MΩ·cm and a recovery rate as high as 96%. The E-Cell-3X module is suitable for the most demanding industries, such as microelectronics. Its strengths include extensive technical expertise in EDI modules and high recovery rates; its weakness is the relatively high price, with a single MK-3 module costing approximately $80,000.
Evoqua: Acquired by Xylem in 2023 for $7.5 billion. The CDI-LX system has a flow rate of 2.5–180 GPM, and the IONPURE LX-Z module is specifically designed for industrial deionized water. Laboratory systems achieve water quality of 0.055 µS/cm. Advantages include mobile deionized water services (24/7 delivery and resin replacement) and chemical-free CEDI technology; A disadvantage is that the integration of product lines following the acquisition is still ongoing.
Merck Millipore: The Milli-Q series is the industry standard for Type I deionized water in laboratories, with a resistivity of 18.2 MΩ·cm and TOC < 2 ppb. The Milli-Q IQ 7000 is equipped with a smart touchscreen and a Q-POD dispensing arm. Advantages include the highest brand recognition in the laboratory sector and global coverage for consumables; Disadvantages include a primary focus on laboratories, with few large-scale industrial systems.
GE (now SUEZ): The E-Cell MK-3X module has a resistivity of 16–18 MΩ·cm and a maximum flow rate of 3.4 m³/h. The MK-2PharmHT model is specifically designed for the pharmaceutical industry and supports thermal disinfection. Advantages include the originality of its EDI technology and deep expertise in the pharmaceutical industry; disadvantages include the brand’s integration into SUEZ and the gradual reduction of its independent product lines.
Pentair: Offers deionization (DI) filters; the Pentek PCF series filter cartridges reduce TOC through post-treatment. Its strengths lie in its comprehensive water treatment industry chain and extensive coverage of both residential and commercial markets.
Culligan: Provides portable ion exchange and automated deionization solutions; systems can be customized with multiple technology modules, including softening, RO, and CEDI. Its strengths include a dense service network and suitability for small and medium-sized commercial customers.
Pall Corporation: The Cascada LS laboratory ultrapure water system employs multi-stage purification, while its military-grade mobile deionized water treatment units can process seawater and brackish water. Its strengths lie in leading filtration technology and military-grade quality standards.
Siemens: The company has a presence in the fields of industrial water treatment automation control systems and EDI modules, making it suitable for large-scale industrial projects requiring highly automated integration.
Shanghai Jingchun: A leading company in the industrial pure water sector, capable of consistently producing ultra-pure water at 18.2 MΩ·cm, serving over 1,000 clients. Jkon Environmental (Shenzhen): Provides customized deionized water treatment solutions. Wenzhou Haideneng: Specializes in industrial DI systems and EDI modules. Dongguan Qianjing: A manufacturer of laboratory and industrial-grade deionized water equipment. Sichuan ZYM: Laboratory deionized water treatment equipment; ZYM models range in price from $1,000 to $3,174.
When selecting a deionized water manufacturer, you must first clarify your water quality requirements:
1. For laboratory analysis, Merck Milli-Q or ELGA are essential choices, as they can consistently produce Type I deionized water at 18.2 MΩ·cm;
2. Semiconductor manufacturing requires EDI technology; modular solutions from SUEZ and Evoqua are the mainstream choices;
3. The pharmaceutical industry should prioritize SUEZ PharmHT or Pall, which have experience in USP compliance;
4. For boiler feedwater in the power industry, the Evoqua IONPURE series is recommended.
Next, consider flow rate: for laboratory applications requiring tens of liters per day, choose a benchtop system; for industrial-scale applications requiring several metric tons per hour, choose a modular EDI system. Next, consider the budget: Laboratory deionized water systems range from 50,000 to 150,000 RMB, while individual industrial EDI modules cost approximately $80,000.
Finally, consider service options: Evoqua offers mobile deionized water delivery, and ELGA provides a subscription-based WaaS (Water as a Service) model. It is recommended to first contact 2–3 deionized water manufacturers to request water quality reports and quotes, and then make a final decision based on actual feedwater conditions and output requirements.
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