CSIDefender® is the world leader in powerful, innovative, and effective copper silver ionization solutions for Legionella growth prevention.
Designed, engineered, and manufactured in Canada since 2002, CSIDefender® has been proven in over 6,200 installations across North America and around the world.
What we do
We specialize in providing tailored, discreet, and cost-effective Legionella growth prevention solutions in hospitals, nursing homes, hotels & resorts, residential and commercial buildings, military facilities, and cruise ships.


With more than 46 models and custom, performance based specifications, we can address Legionella challenges in facilities of any size.
Team and Technology
Our leading team of engineers, scientists, researchers, and Legionella experts are constantly advancing and evolving the capabilities of our products. Through a model of continuous improvement and research, we strive to provide innovative and exceptional Legionella growth prevention solutions that drive the industry forward and provide facility owners and managers better protection against a potential outbreak.

Because of our commitment to excellence, we proudly support the following industry related organizations:

Canadian Society for Mechanical Engineering
Canadian Society for Mechanical Engineering
American Society of Mechanical Engineers
American Society of Mechanical Engineers
Canadian Healthcare Engineers society
Canadian Healthcare Engineers society
American Society of Heating, Refrigerating and Air-Conditioning Engineer
American Society of Heating, Refrigerating and Air-Conditioning Engineer
Infection Prevention & Control Canada
Infection Prevention & Control Canada
Recognized Technology for the Control of Legionella
CSI technology has been proven and endorsed by some of the world’s most reputable organizations, including:

The World Health Organization (WHO) recognizes “metal ionisation (copper and silver)” as an accepted technology for the eradication of Legionella.

Legionella: Guidelines for Drinking-water Quality, WHO (2004)

Legionella and the prevention of legionellosis (2007)

The Environmental Protection Agency (EPA) recognizes copper silver ionisation as a “control method designed to disinfect an entire water distribution system” for Legionella control and prevention.

Legionella : Drinking Water Fact Sheet, EPA, (2000)

Systems: Scientific Literature Review (2016)

OSHA technical manual on Legionnaire’s Disease, section III, states that facility water treatment to control Legionella growth includes “the use of metal ions such as copper or silver (which have a biocidal effect)

The CDC (Centers for Disease Control and Prevention) released a new toolkit for building owners and managers that recognizes copper silver ionization technology as an effective means of Legionella growth prevention.

Developing a Water Management Program to Reduce Legionella Growth & Spread in Buildings, CDC (2017)

“CSA Z317.13.12” states that “Copper-silver ionization facility water treatment may be installed in DHW Loops to discourage growth of Legionella.”
CSI’s Reach
CSI Technology has been installed in 7 countries since 2002, and that number keeps growing!

Let’s talk about How CSI Defender® can keep your water safe