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Table 2

Training and testing statistics of MLP models

	Input combination	Training			Testing
	Input combination	R	RMSE	MAE	R	RMSE	MAE
MLP1	Na	0.931	666.86	220.68	0.949	323.49	29.06
MLP2	Na, HCO₃	0.938	792.99	488.35	0.955	393.63	151.41
MLP3	Na, HCO₃, Ca	0.995	172.01	43.34	0.994	107.41	5.74
MLP4	Na, HCO₃, Ca, Mg	0.998	116.47	37.97	0.997	83.81	6.52
MLP5	Na, HCO₃, Ca, Mg, SO₄	0.999	120.65	57.93	0.998	67.67	17.34

	Input combination	Training			Testing
	Input combination	R	RMSE	MAE	R	RMSE	MAE
MLP1	Na	0.931	666.86	220.68	0.949	323.49	29.06
MLP2	Na, HCO₃	0.938	792.99	488.35	0.955	393.63	151.41
MLP3	Na, HCO₃, Ca	0.995	172.01	43.34	0.994	107.41	5.74
MLP4	Na, HCO₃, Ca, Mg	0.998	116.47	37.97	0.997	83.81	6.52
MLP5	Na, HCO₃, Ca, Mg, SO₄	0.999	120.65	57.93	0.998	67.67	17.34