This study demonstrates how coliform organisms might exist under hours of contact with one mg/l of chlorine or even greater concentrations. The investigation discovered a train of events whereby a Crustacea harboring coli forms, while passing through a spigot, becomes ruptured by the velocity of the water, and is almost immediately flushed into a sample bottle containing sodium thiosulphate. The chlorine is neutralized and the coliforms are distributed throughout the sample, resulting in illogical bacteriologic results.

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The flouridation system now performing within San Francisco's water system is not the one that first went on‐stream a score of years ago. Here's a brief history of its evolvement.