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On-Site Sodium Hypochlorite Generation...

This webinar is: $25
Registration for this class ends on April 1. 

April 15, 2021
10:00 am - 11:00 am
1.0 Contact Hour available
Attendees: Water Quality

On-Site Sodium Hypochlorite Generation as a Safe and Efficient Alternative to Chlorine Gas or Commercial Strength Bulk Hypochlorite for Water Disinfection

Description: This 60-minute seminar will provide water system managers, operators and engineers a practical understanding of the science and implementation behind on-site sodium hypochlorite generation (OSHG) as a source of chlorine disinfection capacity for water and wastewater plants as well as distributed well systems.     


  1. The basics of electrolytic generation of sodium hypochlorite or bleach
    1. Understanding the relationships between table salt (NaCl), electricity, softened water, hydrogen and the bleach product
    2. Economic considerations versus bulk hypochlorite and OSHG
  2. Equipment Components and Technical Design
    1. Previous generations of OSHG equipment versus current generation
    2. Role of equipment components
    3. Process flow diagram walk-through
    4. Engineering design considerations and lessons learned
  3. Case Studies:
    1. San Diego, CA 30MGD conversion from bulk bleach to OSHG
    2. Nashville, TN 180MGD conversion from gas chlorine to OSHG
    3. Other cases studies include multiple well sites and distribution system residual control

Presenter Bio

Gunnar Thordarson
Executive Vice President & Founder, PSI Water Technologies, Inc.

Gunnar co-founded Chemical Services Company in 1988 to provide alternative disinfection technology as a response to a toxic gas ordinance being adopted in California communities. He was also the co-founder and President of ClorTec and built the company from a small operation to a dominant On-site Sodium Hypochlorite generator manufacturer.  In 1999, he and his partner, Brent Simmons, sold ClorTec to Severn Trent Services.  Gunnar took over as Vice-President of the Water Purification Division of Severn Trent Services. 

In 2003 Gunnar co-founded Process Solutions Inc. (now PSI Water Technologies), a technology company providing disinfection solutions. PSI Water Technologies developed the patented Microclor® On-site Sodium Hypochlorite Generation System, as well as the Tank Shark® reservoir mixing system. Gunnar attended the University of California, Davis and has a degree in Economics.

Learning Outcomes:

  • Attendees will understand the basics of on-site generation of hypochlorite as an option for water or wastewater disinfection versus gas chlorine or commercial strength bleach
  • Attendees will understand the roles of OSHG components as part of an overall OSHG system
  • Attendees will be able relate to many applications of OSHG in both large and small plants as well as in applications distant from plants in the well fields or distribution systems

Water Quality Committee members are offering information with these unique webinars. Register for one class, or to obtain an accumulation of 5.0 Contact Hours register for these five 1-hour webinars. Webinars will run from April 14 through April 16th between 8:00 am - 11:00. 

Registration Options:
Fill-out this form Once and email schickarmane@ca-nv-awwa.org 
OR  Register Online on each class page. 

Water Quality Improvement Through Water Storage Tank Mixing
[Register Online]
THM Mitigation In Water Distribution Systems 
[Register Online]
Disinfectant Residual Control In Water Distribution Systems
[Register Online
On-Site Sodium Hypochlorite Generation 
[Register Online
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5.   The Science of Water and Wastewater Treatment Polymer Activation
[Register Online]
10:00 AM - 11:00 AM ONLINE WEBINAR

Refund Policy

Requests for refunds and transfers must be made in writing and are subject to the following conditions: Full refund of fee paid (minus 25% handling fee) will be issued for cancellations received more than 15 days prior to class start date. All fees are non-refundable thereafter. Transfers are based on availability. No transfer requests will be authorized if they are not received more than 15 days prior to class start date. A 100% refund or credit of your registration fee will be issued if a class is canceled by the Section.

Transfer Policy

Requests for transfers must be made in writing and are subject to the following conditions: Transfers are based on availability.  No transfer requests will be authorized if they are not received more than 15 days prior to class start date.