Sewage fields filtration

Until 1895 he stayed with the Massaehusetts State Board of Health, one of the leading organisations in this field. He was primarily eoneemed with water and sewage investigations eondueted at the Lawrenee Experiment Station. He in addition leetured at MIT on biology and bacteriology. In 1895 he conducted in Louisville KY basic studies on water purification, particularly with the so-called rapid sand filtration, which are described in his classic 1898 Report. 

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