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Benefits of using a disinfectant residual

Charles N. Haas
Journal (American Water Works Association)
Vol. 91, No. 1, Maintaining Disinfection (JANUARY 1999), pp. 65-69
Stable URL: http://www.jstor.org/stable/41296473
Page Count: 5
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Abstract

Water distribution systems in the United States routinely carry chlorine residuals < 0.05 mg/L and invariably carry residuals > 0.1 mg/L. This article outlines some of the benefits of using chlorine as a disinfectant residual and considers system characteristics (e.g., system age and vulnerability) that support this application. Benefits accruing to maintenance of a chlorine residual include protecting against modest degrees of intrusion of contaminants, serving as a sentinel for the presence of such contamination, and reducing the potential for growth of heterotrophic organisms.

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