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Chemical Control of Tree Roots in Sewer Lines

John F. Ahrens, Oliver A. Leonard and Neal R. Townley
Journal (Water Pollution Control Federation)
Vol. 42, No. 9, Annual Conference Issue (Sep., 1970), pp. 1643-1655
Stable URL: http://www.jstor.org/stable/25036780
Page Count: 13
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Chemical Control of Tree Roots in Sewer Lines
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Abstract

Studies were made of herbicides that would selectively kill tree roots in sewer lines by the flooding technique. Metham and dichlobenil were used and, in some experiments, a surfactant was added. Toxicity was found to be a minor problem. One-hour flood treatment with metham, dichlobenil, and combinations of the two killed all roots in the line and most of the roots in the joints inspected. Metham also killed roots extending a short distance outside joints. Initial costs of chemical flooding and mechanical root removal were about the same at Sacramento, Calif., but chemical flooding by killing roots, not merely pruning them, seems more economical overall.

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