Thanks bimr.
But the criteria of recirculation cooling water mention the AL. ion must below 0.1 mg/l by EPA of USA.
Our effluent of municipal wastewater treatment is listed below:
1.Conduc.--406~468 us/cm
2.TDS---190~220 mg/l
3.TH---150~180 mg/l as CaCO3
4.Chloride--20~30 mg/l
5.Sulfide---50~70...