Extremely thorough report on Legionella control. Link below. My suggestion of BAQ (Lauryl Dimethyly Benzyl Ammonium Chloride) (prior post to one below) is on their list but less preferred. Site page link. PDF & DOC versions available. "The Prevention of Legionellosis in New Zealand: Guidelines for the control of legionella bacteria" 2012. 107 pages ! http://www.health.govt.nz/publication/prevention-legionellosis-new-zealand-= guidelines-control-legionella-bacteria Russell Ref: D Daniel. ________________________ On 11 April 2014 22:43, RussellMc wrote: > *Water temperature as a primary means of legionella control is worth > knowing about.* > > *Legionella control:* > > FROM: Managing legionella in hot and cold water systems > > http://www.hse.gov.uk/healthservices/legionella.htm > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .