. History of the Medical Society of the District of Columbia, 1817-1909. iltration in their rela-tion to the public water supply of this District, by thecourtesy of Gen. John M. Wilson, Chief of Engineers, A., visited the experimental plant established by Colo-nel Miller and found the filters as described above. Themechanical filter was the very best that could be made,while the slow sand filter was necessarily merely in minia-rture of what it would be when in practical use. The pro-duct of the mechanical filter was a beautiful and clearwater; that of the slow sand filter was not quite so
. History of the Medical Society of the District of Columbia, 1817-1909. iltration in their rela-tion to the public water supply of this District, by thecourtesy of Gen. John M. Wilson, Chief of Engineers, A., visited the experimental plant established by Colo-nel Miller and found the filters as described above. Themechanical filter was the very best that could be made,while the slow sand filter was necessarily merely in minia-rture of what it would be when in practical use. The pro-duct of the mechanical filter was a beautiful and clearwater; that of the slow sand filter was not quite so trans-parent, but sufficiently so to suit reasonable bacterial results were in favor of the slow sand Miller believed that the bacterial efficiency of themechanical filter was sufficient for safety, and as he desiredto furnish the most attractive looking water, he recom-mended the mechanical method of filtration. The com-mittee was considerably perturbed at this outcome of ColonelMillers investigations. It was confronted by this report. 41
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