In 2004, SPL published the first field trial of chlorine dioxide for control of Legionella pneumophila applied to a hospital's secondary water distribution system. (See Keeping Legionella out of Water Systems. Sidari, F.P., Stout, J.E., VanBriesen, J.M., Bowman, A.M., Grubb, D., Neuner, A., Wagener, M.M., Yu, V.L., Journal of the American Water Works Association, Vol. 96, No. 1, pp. 111-119, January 2004.) The results of that 18-month study, which appeared in the Journal AWWA, showed chlorine dioxide was effective in controlling Legionella.
Recently, SPL conducted a case study of that same hospital, which had been using chlorine dioxide since 2000, to validate the conclusions of the 2004 study and evaluate long-term use of this biocide. The article Maintaining Legionella Control in Building Water Systems by Frank P, Sidari III, Janet E Stout. et al., appears in the October issue Journal American Water Works Association.