Abstract
This article discusses a situation at Brick Township, New Jersey, where the delivered water went from being in equilibrium with a thin calcium carbonate film, to being an aggressive water over a three‐year period from 1993 to 1996. This caused a reduction in the quality of the delivered water as demonstrated by noncompliance with the Lead and Copper Rule (LCR). Additionally, the water changed quality (unanticipated pH increases) in the distribution system and probably deteriorated the mortar linings of ductile‐iron mains. The addition of CO2 to the process tripled delivered water bicarbonate alkalinity concentrations and allowed a 50% increase in calcium hardness. These improvements reversed the corrosive characteristics of the delivered water, stabilized the water in the distribution system, and returned Brick Utilities to compliance with the LCR.
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