As Per MPCB, Below is the list of general chemical used in ETP 1.       For pH neutralization: Acids (HCl) and base (NaOH) 2.       Coagulant / Settling Aids: Aluminium Sulphate, Ferric Aluminium Sulphate, Ferric Sulphate, Ferric Chloride, these may be independent or in combination with Poly Electrolytes (Polymers) 3.       For Specific Ion removal, chemicals required as per chemistry of treatment. 4.       Nutrients: Urea, Di-ammonium Phosphate 5.       Disinfectant: Chlorine, Bleaching Powder (Sodium Hypo-chlorite), Ozone 6.       Adsorption / Absorption: Activated Carbon 7.       Ion Exchange – based on the specific ion to be removed.