Copper Silver Ionization
Legionella Water Treatment Solutions

Commercial & Healthcare facility potable water treatment
Legionella growth control and prevention since 2002.



Get CSI Legionella growth prevention solution performance specs tailored for your construction project with just a few clicks.



Reputable medical & commercial copper silver ionization Legionella growth prevention water treatment solutions that deliver results, are easy to install and can fit any budget.

Copper Silver Ionization
Legionella Water Treatment

Copper-silver ionization technology solutions, by CSIDefender®, have been deployed domestically in North America and exported to Europe, Asia, and the Middle East for almost 20 years.

CSIDefender® copper silver ionization solutions are engineered to protect healthcare facilitiesnursing homeshotelsschools, large residential buildings, and military establishments from Legionella growth in potable water distribution networks.

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CSIDefender® has a proven record to help prevent the growth of Legionella bacteria in facility potable water distribution networks. Globally recognized since 2002, CSIDefender® is the most powerful and reliable copper silver ionization solution in the industry.

Supported by certified water management vendors, CSIDefender® are fully automated ionization control systems that disperse industry-proven and accepted copper and silver ion concentrations into facility water distribution networks. CSIDefender® water treatment solutions are known for their performance to help prevent potential Legionella exposure risks to facility occupants.


Copper Silver Ionization Solutions by CSIDefender® provide better performance through superior engineering design. 100% Made in North America, these industry leading CSI Chamber Cells include eight “Certified Pure” ionization electrodes. They also feature commercial grade electrical connectivity protection all housed in a cut grooved Schedule 40 (316) stainless steel external jacket.

Copper Silver Ionization Chamber Cells

Copper Silver Ionization Cells by CSIDefender® provide better performance through superior engineering design. 100% Made in North America, these industry leading CSI Chamber Cells include eight “Certified Pure” ionization electrodes.


Remote Monitoring and Alarms

Every CSIDefender® Controller is fully compatible with standard communication protocols, allowing users to interface with any building management system (BMS) and monitor the technology performance in real time. For those with no BMS or limited telemetry resources, each CSIDefender® controller features a standard visual LED operational status display in addition to PLC password protected access for facility personnel.


CSI Data Logging & Reporting

Get advanced information about your entire potable water distribution network, ensure systems are running smoothly, and detect any issues through online and interactive reports on any device.


Copper Silver Ionization Controllers

Copper Silver Ionization Controllers by CSIDefender® are the power and brains behind your Legionella growth prevention solution. These innovative CSI controllers are software-based. They are also fully automated to anticipate and react to various water conditions without the need for human intervention


Copper-Silver Ionization Legionella Growth Prevention & Compliance
Solutions for Domestic Hot Water (DHW) or Point of Entry (POE) Applications.

Legionella Growth Control in
Any Potable Water Conditions

Unmatched Water Flow Capacity
and Electrode Surface Contact Area

Industry known, reliable and easy
to use cut grooved connection.

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3rd Party Certified Pure High
Quality Electrodes

Schedule 40, 316 Stainless Steel

Fire and Plumbing Code Compliant

Why Choose CSIDefender ®

Copper–Silver Ionization by CSIDefender® is a Legionella water treatment solution primarily used for Legionella growth control and prevention in healthcare, nursing homes, and hotel facilities. Legionella is a type of bacterium responsible for Legionnaires’ disease, a severe form of preventable pneumonia. Commercial and medical size Copper-Silver Ionization technology is recognized by the EPA, CDC, WHO and many other public health authorities around the world. The technology is commonly specified by consultant engineers in both new construction projects or for retrofits in existing facilities. Copper-silver ionization has shown to decreases the risks of Legionella exposure in facility potable water distribution networks for well over 20 years.

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Teamwork with
Consultant Engineers

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Continuous Evolution
and Innovations

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The Most Qualified
& Experienced Team

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We Can Handle
Any Requirements

News and Updates about CSI

blog 1covid-19legionella
15 October 2020

CDC, training center warn of potential Legionella bacteria in low- or no-occupancy workplaces

Photo: Centers for Disease Control and Prevention Atlanta — Workplace water systems in facilities that had reduced occupancy or were…
blog 2legionella
15 June 2020

COVID-19 and Legionella Dangers in Commercial Facilities

Industry experts raising concerns in relation to Legionella bacteria presence within temporarily closed facilities due to COVID-19 pandemic.
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6 January 2020

Legionella Water Treatment Solutions Location Strategies – Part 3 of 3

Point of Entry (POE) Legionella Water Treatment Strategy and Copper Silver Ionization: Point of Entry (POE) water treatment applications treats…

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Copper Silver lonization Solutions. Let’s talk about How
CSIDefender ® can keep your water safe Email Us Today!

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CSIDefender® Legionella Water
Treatment Solutions

CSIDefender® is the world leader in powerful, innovative, and effective copper-silver ionization solutions for Legionella potable water treatment growth prevention and compliance. Designed, engineered, and manufactured in Canada since 2002, CSIDefender® has over 7,300 installations across North America and around the world

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.