1) What is chlorine dioxide (ClO2) and how is it used in facilities?

Chlorine dioxide is a disinfectant commonly generated on site and injected, often into hot water lines, to control Legionella and other microbes as a secondary disinfection method in potable and utility water systems.

2) Where is chlorine dioxide applied for Legionella control?

It is used worldwide in potable and utility water systems, frequently in hospitals, healthcare facilities, and cooling towers. It is also used in food and beverage processing, including cleaning fruits and vegetables.

3) What is the EPA maximum for chlorine dioxide in drinking water?

The EPA recognizes chlorine dioxide as a drinking-water disinfectant and limits its maximum concentration in drinking water to 0.8 ppm.

4) How does chlorine dioxide control Legionella and biofilm?

ClO₂ reacts with oxidizable cell components, disrupting metabolism. It penetrates polysaccharide biofilm, breaks it up, and exposes previously protected Legionella so they can be killed in the bulk water.

5) How do you size a Legionella control chlorine dioxide system?

Base the design on daily and peak water use, water quality, and the desired residual. Use a sizing calculator to determine the appropriate capacity.

6) How is chlorine dioxide different from chlorine?

• Oxidation capacity: ClO₂ can accept up to five electrons (chlorine accepts two).
• Reaction pathway: ClO₂ uses radical electrophilic abstraction.
• By-products: Does not form chlorinated organics (THMs, HAAs) to the same extent.
• Efficiency: About 2.6× more efficient per ppm than standard chlorine.
• Monitoring: Chlorites formed in water should be monitored daily for safety.

7) What features define a modern chlorine dioxide system?

• Produces ~99.5% pure ClO₂, free of chlorine residuals
• On-demand generation without an external storage tank
• Multiple dosing points from a single generator
• On-site capacity upgrades as needs change
• Safety interlocks, reporting, and communication options

8) How is production performance measured and monitored?

Optical sensors measure generator output concentration. Flow sensors and chemical consumption data indicate production efficiency. Optional remote monitoring can send performance data for review.

9) Which facilities are typical candidates?

Hospitals, universities, hotels, and government buildings use chlorine dioxide systems to mitigate Legionella risks across various precursor systems while maintaining operational safety.

10) Are there reference materials on biofilm and MIOX effects?

Reference items include:

• Chlorine Dioxide Levels and MIOX Effects on Biofilm Chart
• Chlorine Dioxide System – Secondary Disinfection (PDF)

11) Where can I get product literature or request a quote?

Download the PDF above or contact us for details, sizing, and pricing:

• Legionella Control Chlorine Dioxide Systems (overview, certifications, features)
• Secondary Disinfection Systems
• Legionella Control Systems
• Contact Page for Chlorine Dioxide System Quotes