Data from the laboratory-scale column studies (shown in Figures 7 and 8) show pH-sorted soluble Mn²⁺ concentrations as a function of temperature for the 10-cm media depth and the 25-cm media depth, respectively. As was seen in the full-scale Harwood's Mill data evaluation, a decrease in water temperature yielded a decreased ability of the MnO_x(s)-coated media to remove soluble Mn²⁺ at either media depth. In general, as both the temperature and pH decreased, the soluble Mn²⁺ concentration in the column increased. For example, soluble Mn²⁺ concentrations at 5 °C were higher for data in the pH range of 6.0–6.5 than data in the pH range of 6.5–7.0. It should be noted that soluble Mn²⁺ concentrations were below the recommended target of 0.015 mg/L at temperatures below 10 °C for pH conditions greater than 7.5. Data presented in Table 1 show mean soluble Mn²⁺ concentration as a function of pH under low water temperature conditions (4–7 °C) for the laboratory-scale data. As shown in Table 1, soluble Mn²⁺ concentration decreased with an increase in solution pH.