18.25 MΩ·cm Ultra Pure Water System | 0.5 TPH Two-Stage RO + EDI Water Purification Equipment

Laboratory Water Purification Solution

18.25 MΩ·cm Ultra Pure Water: The Complete Guide to 0.5 TPH Two-Stage RO + EDI Systems

Everything you need to know before choosing a high-purity water purification system for laboratories, pharmaceutical facilities, semiconductor manufacturing, and industrial applications.

Key Features

✔ 18.25 MΩ·cm Maximum Resistivity

✔ 0.5 TPH (500 LPH) Production Capacity

✔ Two-Stage Reverse Osmosis System

✔ Continuous EDI Purification Technology

✔ 316L Stainless Steel Aseptic Storage Tank

✔ Fully Automatic PLC Control

What Is 18.25 MΩ·cm Ultra Pure Water?

Water purity is measured by electrical resistivity. The higher the resistivity, the fewer dissolved ions and contaminants remain in the water.

At 18.25 MΩ·cm (25°C), water reaches the highest practical purity level available for industrial and laboratory applications. This quality complies with internationally recognized standards such as:

• ASTM D1193 Type I

• ISO 3696 Grade 1

• CLSI C3-A4

Ultra-pure water is essential for:

Analytical Chemistry & HPLC

• Solvent preparation

• Mobile phase dilution

• Laboratory analysis

Cell Biology & Molecular Biology

• PCR testing

• Cell culture preparation

• Buffer solution preparation

Semiconductor Manufacturing

• Wafer cleaning

• Photolithography rinsing

• Precision component cleaning

Pharmaceutical Industry

• Reagent preparation

• Equipment cleaning

• Quality control laboratories

Electronics Manufacturing

• PCB cleaning

• Battery research

• Precision testing applications

Even trace contamination can affect analytical accuracy, production quality, and equipment performance.

Two-Stage RO + EDI Purification Process

The most reliable method for producing 18.25 MΩ·cm ultra-pure water combines two-stage reverse osmosis with EDI polishing technology.

Process Flow

Raw Water

↓

Multimedia Filter

↓

Activated Carbon Filter

↓

Water Softener

↓

5 Micron Cartridge Filter

↓

RO Stage 1

↓

RO Stage 2

↓

EDI Module

↓

316L Stainless Steel Aseptic Tank

↓

18.25 MΩ·cm Ultra Pure Water

Stage 1 – Pretreatment System

The pretreatment section protects downstream equipment and improves purification efficiency.

Multimedia Filter

Removes:

• Suspended solids

• Turbidity

• Sand particles

• Sediment

Activated Carbon Filter

Removes:

• Chlorine

• Chloramine

• Organic compounds

• Odors

Water Softener

Removes:

• Calcium ions

• Magnesium ions

Preventing membrane scaling and extending membrane lifespan.

5 Micron Cartridge Filter

Provides final pretreatment protection before water enters the RO membranes.

Stage 2 – First Pass Reverse Osmosis

The first-stage RO membrane removes:

• 96–98% of dissolved salts

• Bacteria

• Viruses

• Endotoxins

• Heavy metals

Water conductivity drops dramatically after the first pass.

Stage 3 – Second Pass Reverse Osmosis

The permeate from the first RO stage enters a second RO system.

Benefits include:

• Conductivity below 1 μS/cm

• Resistivity above 1 MΩ·cm

• Reduced carbon dioxide levels

• Improved EDI efficiency

• Extended EDI module lifespan

Stage 4 – EDI Module

Electrodeionization (EDI) continuously removes remaining ions without chemical regeneration.

Advantages of EDI

• No acid regeneration

• No caustic soda regeneration

• Continuous operation

• Stable water quality

• Lower operating costs

• Environmentally friendly

Output water resistivity can reach:

≥18.25 MΩ·cm

Stage 5 – 316L Stainless Steel Aseptic Storage Tank

Ultra-pure water easily absorbs contaminants from the surrounding environment.

The system includes a premium 316L stainless steel storage tank featuring:

• Electropolished interior surface

• PTFE vent filter

• UV sterilization interface

• Hygienic aseptic design

Ensuring long-term water quality stability.

Technical Specifications

Main Advantages

No Chemical Regeneration

EDI eliminates the need for acid and alkali regeneration chemicals.

Stable Water Quality

Consistent production of 18.25 MΩ·cm ultra-pure water.

Low Operating Costs

Reduced labor, chemical consumption, and maintenance expenses.

Compact Skid-Mounted Design

Factory assembled and tested before shipment.

Complete System Package

Includes pretreatment, RO, EDI, storage tank, and control system.

Intelligent PLC Control

Real-time monitoring of:

• Conductivity

• Resistivity

• Flow rate

• Pressure

• Temperature

Applications

Laboratory Water Systems

Pharmaceutical Manufacturing

Semiconductor Production

Electronics Industry

Biotechnology Research

Precision Metal Finishing

Cosmetic Manufacturing

Industrial High-Purity Water Supply

Frequently Asked Questions

Q1: What feed water quality is required?

The system is suitable for municipal water with TDS up to 2000 ppm. Higher TDS water can be treated with customized pretreatment solutions.

Q2: How is EDI different from traditional mixed-bed DI?

EDI continuously regenerates resin using electricity, eliminating chemical regeneration and downtime.

Q3: What maintenance is required?

Routine maintenance includes:

• Cartridge filter replacement

• RO membrane inspection

• UV lamp replacement

• Periodic sanitization

Q4: Can the system be customized?

Yes. Available capacities include:

• 0.25 TPH

• 0.5 TPH

• 1 TPH

• 2 TPH

• 5 TPH

• 10 TPH

• 20 TPH

• 50+ TPH

Customized voltage, materials, and purification configurations are available.

Why Choose Yufeng Water Treatment?

Professional Manufacturer

More than 10 years of experience in industrial water treatment equipment manufacturing.

Customized Engineering Solutions

Designed according to actual water quality and application requirements.

Factory Direct Pricing

Competitive pricing without distributor markups.

Global Technical Support

Professional installation guidance and after-sales service worldwide.

Proven Industry Experience

Serving laboratory, pharmaceutical, semiconductor, and industrial customers worldwide.

Request a Free Technical Proposal

Contact our engineering team today and receive:

✔ Free Water Quality Analysis

✔ Free Technical Consultation

✔ Customized System Design

✔ Detailed Quotation Within 24 Hours

Shandong Yufeng Water Treatment Equipment Co., Ltd.

Professional Manufacturer of Reverse Osmosis Systems, EDI Ultra Pure Water Systems, Water Softeners, and Industrial Water Treatment Equipment.

Website: https://www.yufengwatertreatment.com

WhatsApp: +86 185 5398 7893