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COPPER SULPHATE AND WATER PURIFICATION.

JAMA. 1904;XLIII(16):1148-1149. doi:10.1001/jama.1904.02500160050006.
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The widespread current interest in the question regarding the effect of copper sulphate on public water supplies dates back to some important observations published last May by Moore and Kellerman in a bulletin of the Department of Agriculture.1 The experiments, having in view the application of this salt (CuSO4) to the water of reservoirs, appear to have been undertaken in the first instance with the aim of discovering a means of preventing the unpleasant odors and tastes due to the growth of algæ in stored water. A possible extension of this method to the destruction of pathogenic germs was considered by the writers of this bulletin incidental to their main investigation. The wide publicity given to the authors' experiments on the action of copper sulphate on pathogenic microbes appears not to have been foreseen by them. It is certainly true that some have drawn unexpected conclusions from the

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