Legionella

The legionella bacterium (Legionellaceae) is a family which contains more than 48 known species that are water-dwelling, Gram-negative, and aerobic. These bacteria are also potentially pathogenic for humans. They require still or recirculated water in the 25-50°C range to grow optimally, and thus they are found primarily in air washers, cooling towers, dead pipes, water tanks and shower heads. Even low UVC doses inactive easily and effectively Legionella.