Can biofilms that form on pipe walls protect Legionella bacteria from disinfectants?

Biofilms that develop on the walls of plumbing systems can indeed provide a protective environment for Legionella bacteria against disinfectants. Within these biofilms, Legionella can be shielded from chemical agents, such as chlorine, that are typically employed to disinfect water systems. The structural composition of a biofilm creates a complex matrix where bacteria can embed themselves, often in a state that is more resistant to harmful substances.

Moreover, the intricate layering of bacteria and extracellular polymeric substances (EPS) in biofilms can impede the penetration of disinfectants, reducing their efficacy. This means that even in the presence of adequate disinfectant levels in the bulk water, the bacteria within biofilms could remain relatively unharmed. As such, effective management strategies must consider the presence of biofilms when assessing the risk of Legionella proliferation and optimizing disinfection processes. Understanding this aspect of biofilms highlights the challenges in effectively controlling Legionella in plumbing systems.