Effect of Different Target FES pH Values on Evaporator Station pH Profiles.The effect of changing the target pH of the FES on the evaporator station pH profiles across the season is shown in Figure 3.The major factor affecting the pH of the FES was the pH of the CJ. The phenomenon of the dramatic pH increase in the last body was consistent across the whole season. The pH of the juice exiting the second pre evaporator (preE2) was usually lower than from the first pre evaporator (preE1), which may be because the preE2 was not functioning properly. The largest drops in pH occurred in the pre evaporators and in the 1st body (Figure 3), indicating that the most hydrolysis occurred there.