Several disinfection methods can be effective against Legionella in irrigation systems, including chlorine dioxide, ozone, and ultraviolet (UV) light. Chlorine dioxide is a popular choice due to its ability to penetrate biofilms, where Legionella bacteria often reside. Ozone is also effective, but it requires careful handling and monitoring due to its toxicity. UV light can be used as a secondary disinfection method, particularly in areas where chemical disinfectants are not feasible. It’s essential to follow manufacturer guidelines and local regulations when selecting and implementing disinfection methods.