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Fig. 4. Relationship between reduction 0.01 M calcium chloride–extractable phosphorus (CaCl2–P) and drinking water treatment residual (WTR) Langmuir phosphorus adsorption maxima (Pmax) normalized across WTR application (Pmax x WTR application) for WTR co-blended with biosolids at 125, 250, and 375 g WTR kg–1.