Legionella bacteria can often be misunderstood, even by those working in building management or water safety. Misconceptions can lead to unnecessary panic – or worse, unsafe practices. In this blog we address three Legionella myths we have come across recently and provide practical guidance for managing water systems safely. Myth 1: “I can see Legionella in the water” Some people believe they can identify Legionella visually. One instance involved someone filling a glass with chalky water and claiming it contained the bacteria. FACT: Legionella bacteria are microscopic – between 0.3 and 0.9 μm wide and 2 to 20 μmlong. To put this into perspective, a human hair typically measures between 50 and 120 μm in diameter. Legionella is far too small...