Statistical analysis confirmed the significance of the points
mentioned above. All the differences between the three units concerning
effluent concentrations and ALR values were found to be
significant for all pollutants (Table SM-2). Post Hoc tests for pairs
of units revealed significant statistical difference between unit W9
and the other two units. This confirms a better performance of the
Type I and Type III units, and that the Type III unit has the greater
efficiency among them.