Anionic & cationic polymer injection for phosphate removal, coagulation & filtration. NaOH metering for metal removal. pH control & cyanide removal. Ferric Chloride & alum injection for coagulation. CuSO4 injection for algae control. Metering of lime slurries for pH control (corrosion control) and coagulation. NaOCl injection for caustic and cyanide removal, and disinfection. Sodium Bisulfite for lime control by hexavalent chromium. Metering activated carbon or diatomaceous earth slurries for odour and colour.