There have been a couple of cases of Legionnaire's Disease associated with breathing potting soil in Australia in the last few years, and two cases of Legionalla infecting people who have been in buildings with the bacteria in the cooling tower. All potting mixes carry health warnings here. It's one of those things we accept. Tara -- ______________________________________________________ Tara Deen School of Geosciences Division of Geology and Geophysics Building FO5 University of Sydney NSW 2006 AUSTRALIA Phone: 61-2-9351 4271 Fax: 61-2-9351 0184 Mobile: 061 410 538 655 email: tara@es.usyd.edu.au ______________________________________________________