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Relationship between time and bulk free chlorine concentrations for inactivation of attached B. atrophaeus subsp. globigii spores. Actual bulk free chlorine concentrations were 0.73 and 0.77, 9.5 and 12.1, and 22.5 and 27.9 mg/liter in two independent experiments. The chlorine concentrations are the averages of two experiments (0.75, 10.8, and 25.2 mg/liter). Bars represent the ranges of duplicate experiments.
