Customized double-pass RO plus EDI solution for compact GMP purified water production

Purified water is an important utility in medical device manufacturing, especially for product cleaning, component rinsing, process preparation, and equipment sanitation. For GMP-oriented production environments, stable water quality, controlled conductivity, low particle load, and hygienic operation are essential to reduce contamination risk and support consistent manufacturing quality.

To support its production process, a medical device company in China selected Zhongnuo Water Treatment to design and manufacture a 250 L/h GMP purified water system. The solution converts municipal tap water into stable purified water through pretreatment, double-pass reverse osmosis, EDI polishing, UV sterilization, storage, and distribution to production water points.

The client required a compact and reliable purified water system that could support medical device production while matching GMP-oriented operating expectations.

◎ Production water quality needed to remain stable

Medical device production water must be consistent and controlled to support cleaning, rinsing, and process use. Fluctuations in dissolved ions, particles, or microbial risk could affect production reliability.

◎ Municipal feed water required multi-stage treatment

Although municipal tap water was available, residual chlorine, hardness, suspended solids, and dissolved salts still needed to be reduced before final purified water could be supplied.

◎ The system had to fit a smaller production scale

The required capacity was 250 L/h, so the equipment needed to be compact, efficient, and easy to operate while still using a complete purification process.

◎ GMP-style operation required hygienic final handling

Final storage and supply needed to protect treated water quality. UV sterilization, purified water storage, and a stable supply system were important for reducing downstream risk.

Municipal Tap Water  ->  Raw Water Tank  ->  Raw Water Pump  ->  Multi-media Filter  ->  Activated Carbon Filter  ->  Softening Water Filter  ->  Salt Tank  ->  Security Filter  ->  First-stage High Pressure Pump  ->  First-stage RO System  ->  Second-stage High Pressure Pump  ->  Second-stage RO System  ->  EDI Booster Pump  ->  EDI System  ->  UV Sterilization  ->  Purified Water Tank  ->  Water Supply System  ->  Medical Device Production Water Points

This 250 L/h GMP purified water equipment was designed for medical device production applications. It combines pretreatment, double-pass RO, EDI polishing, UV sterilization, purified water storage, and supply distribution into a compact system suitable for controlled production environments.

Pretreatment for stable membrane operation

The Multi-media Filter reduces suspended solids, the Activated Carbon Filter removes residual chlorine and organic matter, and the Softening Water Filter with Salt Tank support reduces hardness and scaling risk. The Security Filter then provides fine particle protection before the first RO stage.

Double-pass RO and EDI for purified water quality

The first-stage RO removes most dissolved salts and impurities, while the second-stage RO further improves water quality. The EDI System then provides continuous deionization, helping the equipment produce stable purified water with lower chemical handling requirements.

UV sterilization and reliable distribution

After EDI polishing, UV Sterilization provides an additional hygienic safeguard before water enters the Purified Water Tank. The Water Supply System then delivers purified water to medical device production water points.

After installation and commissioning, the purified water equipment successfully met the client’s production water requirements and provided reliable water support for medical device manufacturing.

· Stable purified water output of 250 L/h for production use.

· Improved control of dissolved salts and conductivity through double-pass RO plus EDI.

· Reduced residual chlorine, hardness, particles, and downstream contamination risk.

· Compact system layout suitable for smaller GMP-oriented production areas.

· More reliable water support for cleaning, rinsing, and process preparation.

· Stronger daily production stability through automatic operation and UV sterilization.

Zhongnuo Water Treatment provides customized purified water, ultrapure water, RO, and EDI systems for industrial, medical device, pharmaceutical, food, and manufacturing customers. Each solution is designed around feed water quality, target water standards, site layout, and operating requirements.

· Customized GMP purified water system design for medical device applications.

· Integrated process planning from pretreatment through RO, EDI, UV, storage, and distribution.

· Compact equipment configuration for small and medium production capacities.

· One-stop support covering design, manufacturing, commissioning, and technical service.

1. Why does medical device manufacturing need purified water?

Purified water helps reduce contamination risk and supports consistent cleaning, rinsing, and process preparation in controlled production environments.

2. Why use double-pass RO and EDI for a 250 L/h system?

Double-pass RO provides strong desalination, while EDI further reduces ionic contaminants and supports stable purified water quality with less chemical regeneration.

3. What is the role of UV sterilization?

UV sterilization provides an additional hygienic barrier before storage and distribution, helping reduce microbiological risk in the final water supply.

4. Can this system be customized for different medical device factories?

Yes. Zhongnuo Water Treatment can customize capacity, pretreatment, RO staging, EDI configuration, storage, and distribution according to the site and production process.