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Influence of preincubation with EDTA (20 mM) for 30 min on E. coli resistance to chlorine. (A) Solid line, native cells treated in distilled water, 0.4 ppm chlorine; dashed line, cells preincubated with EDTA and treated in distilled water, 0.4 ppm chlorine. (B) Solid line, native cells treated in TSB (150 ppm), 15 ppm chlorine; dashed line, cells preincubated with EDTA and treated in TSB (150 ppm), 15 ppm chlorine.
