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Glenn Holden
Manager, Chlorine Dioxide and Disinfection

Millennium III™ Chlorine Dioxide Generators

Combining technology and expertise to deliver safe, consistent, high-purity chlorine dioxide

​The Millennium III™​ Chlorine Dioxide Generator is the safest, most reliable solution for disinfection by-product compliance, CxT disinfection credits, iron and manganese removal, and taste and odor control. Concentrated chemical precursors are vacuum fed to safely control reactions, maximizing chlorine dioxide yield efficiency at 95 percent and minimizing by-product formation.  Fail-safe mechanisms prevent chemical feed due to loss of motive water or vacuum, ensuring safe operation.

Millennium III generators comply with NSF 61 standards for drinking water applications and are easy to use and maintain. Evoqua’s best in class local service ensures compliance and eliminates down-time.

Read our recent AWWA Journal article on how chlorine dioxide is helping water treatment plants meet Stage 2 Disinfectants and Disinfection Byproducts Rule  Chlorine Dioxide Preoxidation for DBP Reduction.

Reprinted from Journal, Vol. 109, by permission. Copyright © July 2017 American Water Works Association. Permission to reproduce this document is granted for informational purposes only and does not represent or imply approval or endorsement by AWWA of any particular product or service.



​The Millennium III Series Chlorine Dioxide generators are available in the following configurations:

  • Manual
  • Batch
  • Automatic

 Key Benefits

  • ​Disinfection by-product (DBP) Rule II compliance.
  • The cost-effective, safe generation of chlorine dioxide is a primary design consideration. Generation under vacuum is used to minimize and control the reactions and concentrations.
  • Efficiency / yield is maximized by reaction of chemical precursors in their concentrated form. These reaction conditions favor the immediate formation of chlorine dioxide, thereby minimizing by-product formation found in other types of generators.
  • Direct flow path of motive water and chemical precursors provide for minimal pressure losses and improved flexibility.
  • Unique injector design incorporates vacuum based vapor phase reaction chemistry to improve overall performance and safety.
  • NSF 61 certified for drinking water applications.


Evoqua has over 30 years of experience in chlorine dioxide products and applications.  Learn more about chlorine dioxide and technical applications.

  • Primary and secondary disinfectant for water treatment
  • Pre-treatment for oxidation and removal of iron and manganese
  • Control of reactive water demand where significant ammonia is present
  • Control of slime, algae, bacteria, viruses and protozoa, including Giardia, Cryptosporidium and Legionella
  • THM / THAA control (DBP reduction) and bromate reduction
  • Taste and odor control
  • Biofilm control
  • Mollusk control
  • Sulfide odor control (ClO2)
  • Cooling towers
  • Nitrification prevention
  • Wastewater disinfection
  • Biosolids odor control and disinfection
  • Cyanide destruction

 Aftermarket Support

​Millennium III systems are backed by the industry’s most responsive service organization. Our technical experts can provide assistance with the design of a new system or aftermarket support of an existing site.
​Click on the tiles below to find a representative in your area or to contact aftermarket services. Millennium III™ Chlorine Dioxide Generators