Chlor-floc tablets are intended for purification of small quantities of water for individual use by combined flocculation and disinfection. Removal of Escherichia coll E25, various viruses and Giardia cysts from polluted water by Chlor-floc has been previously demonstrated. This study evaluated the efficiency of removal of Salmonella typhi, Shigella dysenteriae, Vibrio cholerae and rotavirus from simulated hard water of high organic content and colour. All four pathogenic microorganisms were successfully removed within the recommended treatment time. Log removals of 7-8 log were achieved for bacterial pathogens, and a removal of 6.5 log was obtained for rotavirus.

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