Hot and cold water services account for most cases of legionnaires' disease in the UK, and treatments such as chlorine dioxide and ionisation have increased in popularity with the realization that a temperature regime is not always achievable - or effective. This text describes an experiment to directly compare the efficacy of a temperature regime against chlorine dioxide treatment, using a plant that represents a typical installation rather than best practice. It supplies and discusses the detailed results, which suggest that the maintenance of hot water at 60C flow and 50C return does not provide complete protection against the survival of legionella.
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