Prechlorination with chloramine (unit 1) and prechlorination with free chlorine (unit 2) were equally effective in removing and controlling trihalomethane (THM) precursors in parallel pilot systems that varied only in the method of prechlorination. As expected, the THM levels in unit 1 were low and those in unit 2 were high. Control of the bacterial population (as determined by standard plate count) in unit 1 was more consistent than that in unit 2.
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Gregory D. Reed (1983) studied this question.
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