This article, from US Water News, outlines the conversion of the Portland, OR, chlorine gas feed system to liquid sodium hypochlorite in order to "eliminate hazards associated with gas systems and to enhance chlorine residual throughout the distribution system."
The developers of the project brought in a Westfall mixer in order to make the transition while keeping the lines working. The article goes into depth about the details, but the result was a far more stable residual chlorine level even during the spring period, which usually created the worst oscillations in pH and chlorine residual.
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