referred to as full-scale centrate in Table 2), and absorbance spectra of the samples were measured. Centrate was used as it is without any pretreatment. FloPolymer CB 4350 is the polymer that is currently used at Treatment Plant A. Preliminary testing indicated that dilution was needed due to the high absorbance of the centrate, and samples were diluted with distilled water at a ratio of 1:30 or 1:50. It should be noted that the centrate had a strong yellowish color likely caused by the ferric products used during treatment. The polymer concentration was varied from 0.1 to 10 mg/L.