ABOUT
German Technology, Authorized China Distributor
From the permanent magnet method in 1945 to today's fifth-generation variable-frequency resonant electromagnetic field, physical water treatment has evolved over 80 years. We are bringing this technology to China's industrial circulating water systems.
1993
Dewei Han equipment begins deployment at European industrial enterprises
30 years
Focused on industrial circulating cooling water treatment
2020
Technology included in the "2020 Green Technology Promotion Catalog"
to date
Fifth-generation technology has been running long-term across multiple domestic industries.
Brand Story
Make physical commerce a long-term business.
DEWEHA's Variable Frequency Resonance Water Treatment Technology originates from Baden-Württemberg, Germany—a major hub for European industrial technology. Based on electromagnetic induction, this physical approach treats industrial circulating cooling water.
Since 1993, Dewei Han equipment has been deployed across European industrial facilities, specializing in scale prevention and removal, disinfection, algae control, and corrosion protection. Our technology has now evolved to its fifth generation.
Shandong Zhengyi International Trade Co., Ltd., based in Jinan, is the China regional general agent for DEW-HAN. We handle domestic product supply, selection support, installation guidance, and assistance with final acceptance inspections.
Technical Source
Baden-Württemberg, Germany
Domestic Entity
Shandong Zhengyi International Trade
Service Area
National Industrial Projects
Technology Evolution
Five generations of technology solving the same problem.
Demagnetization, heating, insulation aging, electrode wear — each generation addresses the shortcomings of the last.
1945
Generation 1 · Permanent Magnet Method
Belgian engineers discovered that water treated with a strong magnetic field exhibits anti-scaling and descaling properties. Permanent magnet devices require no power, but the magnetic circuit is prone to demagnetization, causing effectiveness to degrade over time.
Second Generation
Solenoid
Using electromagnets instead of permanent magnets reduces demagnetization risks but requires high current, causing coil heating. This limits continuous operation and increases energy consumption.
3rd Generation
High-voltage electrostatic
High-voltage electrostatic fields prevent scaling, corrosion, and disinfection, but insulating materials age quickly, requiring regular maintenance and offering limited effective range.
Fourth Generation
Electrolysis
Water treatment via DC electric field between electrodes causes anode corrosion requiring replacement, limited adsorption capacity, and restricted water throughput.
Fifth Generation
Variable-frequency resonant electromagnetic field
Building on four generations of experience, Dehuihan's current technology uses 0–6 kHz sweeping electromagnetic fields to treat circulating water. It offers high throughput, stable performance, and long service life.
Agent
Who is the local contact?
From selection to acceptance, domestic projects are managed centrally by Shandong Zhengyi International Trade Co., Ltd. Technical documentation and on-site support are provided by the brand owner.
Contact Support1993Year
European industrial applications get started
30Year
Specializing in circulating cooling water treatment
Credentials & Certifications
Verifiable third-party evidence
Scanned copies of qualification documents are acceptable; refer to the original document for specific applicability.
2020 Green Technology Promotion Catalog
2020Promoted by four ministries, including the National Development and Reform Commission, as a recommended direction for variable-frequency resonance water treatment technology.
Certification of Effectiveness for International Scientific Research Institution's Physical Descaling Technology
VerifiedConduct third-party verification of the physical descaling effectiveness and issue a technical performance certification.
German Government Ministries Recognitions and Qualifications
Valid indefinitelyCertified by Germany's Federal Ministry for the Environment, Federal Ministry of Economics and Technology, and Federal Ministry of Education and Research.
PHILOSOPHY
Go Chemical-Free, Embrace Green
Replace chemicals with physical treatment to keep circulating water systems clean without altering water quality, reducing discharge and chemical management burdens.
Understand the technical principles
Working on a circulating water project that requires a chemical substitute?
Send us your operating conditions first. We'll assess suitability before discussing proposals.