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Impact of copper concentration on killing of Legionella at pH 9 in a batch disinfection model. At pH 9, copper concentrations of 4.0 and 0.4 mg/liter failed to kill L. pneumophila in 72 h. However, when the pH of the solution was reduced to 7.0, 0.4 mg of copper per liter achieved a millionfold reduction in the number of L. pneumophila organisms in 1.5 h.
