This article discusses the effectiveness of water treatment processes in coping with relatively small concentrations of pesticides in raw water. Duplicate pilot water treatment plants at the Taft Center were used to evaluate the effectiveness of conventional and auxiliary treatment processes. The methods and procedures used included: the chromatographic method; solubility and incidental loss; coagulation and filtration; chlorine; potassium permanganate; ozone; powdered activated carbon; and, granular activated carbon.

The objective of this study was to formulate and test a pilot filter system for the determination of optimum chemical dosages. The pilot filter was designed to indicate the minimum coagulant dosage required to produce a filter effluent of a given quality and the proper floc strength to maintain that quality throughout a filter run terminated by the development of maximum head loss. This pilot filter would have hydraulic and physical characteristics similar to full‐scale filters and would therefore be representative of the larger filters.

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