A city hotel carried out a Legionella risk assessment to comply with L8 Legionella prevention and as a result several concerns were highlighted. Existing procedures required twice yearly cleaning on the buildings drinking water but this was felt unsatisfactory as a preventative maintenance solution was required. It is well documented that biofilms, that house Legionella, start re-establishing as soon as the treatment process has finished.
The Dutch Ministry of Environment and Health sought a solution for the prevention of Legionella in complex drinking water distribution systems in buildings and instigated a trial, which was carried out under the supervision of the KIWA Water Institute, at the University of Groningen. The existing measures for control of Legionella required twice yearly cleaning and sanitising of the entire drinking water system.
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