A municipal water supply became contaminated with benzene (Cw=50g/L). It was decided that until the contaminant source could be identified and remediated, all household faucets would be fitted with a granular activated carbon(GAC) filter bed to adsorb benzene. A new GAC filter bed was tested with aqueous solutions containing benzene, and the following data was obtained. Cw(mg/L) Cs(mg/g) 100 62.50 66.67 57.14 50.00 52.63 33.33 44.44 20.00 35.71 14.29 29.41 9.09 21.74 How much benzene can be optimally removed by this GAC filter?