In a pilot study that lasted 80 weeks, unozonated and ozonated waters were fed to granular activated carbon (GAC) columns to compare the removal of trihalomethane formation potential by GAC treatment with that by ozone‐GAC treatment. The results were comparable for these treatments.

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Upper 17 cores only; values omitted for more opaline lower cores. "Si/Al omitted because of high radiolarian content. c Upper 9 cores only; values omitted for more opaline lower cores.