Table 1: Raw water variables used for modelling and their correlations with residual Al and turbidity.

VariableUnitCorrelation with residual AlCorrelation with turbidity

1pH of raw water0.210.21
2KMnO4 of raw watermg/L O20.180.33
3Hardness of raw watermmol/L0.270.22
4Colour of raw waterMg Pt0.190.27
5Conductivity of raw watermS/m0.340.38
6Silicates on raw watermg/L0.350.28
7Turbidity of raw waterNTU0.070.06