Reductions greater than or equal to 5 log CFU/g on E. coli O157:H7 were achieved only
267 when the pH of NEO water was 6.5, total washing time was 30 min (30 min wash or 15-15
268 combination) and the direction of salad washer periodically changed during treatment. These
269 treatments were 30 min and 155 mg/L chlorine (5.14 log CFU/g reductions), 30 min and 200