Copper Silver Ionization
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.

Choose CSIDefender® Copper Silver Ionization

Copper Silver Ionization water treatment solutions by CSIDefender® are engineered 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. This CSI technology is commonly specified by consultant engineers globally 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.

copper silver ionization hospital installation
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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

copper silver ionization warranty

Copper Silver Ionization water treatment solution, by CSIDefender®, are for Legionella control and prevention and used in facility potable water distribution networks.

CSIDefender® copper silver ionization solutions are commonly specified by consultant engineers in new construction projects or installed as retrofits found in:

Copper Silver Ionization water treatment technology solutions, by CSIDefender®, have been deployed domestically in North America and exported to Europe, Asia, and the Middle East for over 20 years.

Copper Silver Ionization Water Treatment by CSIDefender®

CSIDefender® copper silver ionization solutions are engineered for Legionella growth prevention. They provide potable water treatment protection for large facilities with complex water distribution networks.

Offering an impressive selection of 46 different medical and commercial grade CSI models, CSIDefender® Legionella solutions can accommodate any size facility regardless of potable water usage or water quality.

These reliable commercial and medical grade copper silver ionization Legionella solutions are ideal for new or existing healthcare facilities, long-term care, hotels, high-rise buildings, schools and much more. This is why the technology is specified by consultant engineers globally to comply with Legionella regulations and guidelines.


Click Here and discover the CSIDefender® copper silver ionization solution that fits your facility needs and expectations in just a few minutes.

CSIDefender® technology comes with a 10-year limited warranty on its controllers and a one year pro-rated warranty on the ionization chamber cells.

Get your custom CSIDefender® quote or CSI technology specifications with just a few simple clicks.

Legionella Engineering Specs

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.

copper silver ionization chamber cell structure

3rd Party Certified Pure High
Quality Electrodes

316 Stainless Steel Jacket

Fire and Plumbing Code Compliant

Copper Silver Ionization Water Treatment News and Updates

covid-19 legionella linkcovid-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…
Legionella water treatmentlegionella
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.
copper silver ionization chamber cellslegionellawater treatment
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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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.