#1.8 Thermal Disinfection & Chemical Injection: What is the Right Mix for your System Update?

Legionella isn’t a “rare edge case” problem—it’s a predictable outcome of physics and biology. When water sits warm and stagnant, it becomes an incubator for bacteria that grows in the biofilm of the piping. In this episode, we step inside the lab to demystify Legionnaires’ disease and the plumbing conditions that allow it to thrive.From the mechanics of aerosolization in showers and misters to the high-stakes environments of hospitals and hotels, we’re breaking down the "why" and "how" of waterborne pathogens. More importantly, we’re getting practical about the engineering and design strategies that actually mitigate risk.What’s on the Menu:The Big Triggers: Understanding stagnation, dead legs, and the "danger zone" temperature ranges where Legionella is most aggressive.Design for Mitigation: How hot water recirculation and flow balancing prevent the "warm and still" conditions that lead to outbreaks.The Thermal Disinfection Strategy: Why programming a high-temp spike while the building sleeps is a powerful tool—and the hardware required to do it safely.Safety vs. Sterilization: The critical role of ASSE 1070 point-of-use mixing and ASSE 1017 master valves in protecting users from scalding during disinfection cycles.If you work in plumbing, hydronics, facilities management, or healthcare design, this episode provides a clear, no-nonsense framework for reducing risk in both commercial and residential systems.