annual maintenance contract for proprietary chemical dosing at cw system, including material supply and service, for one year at sgtpp , annual maintenance contract for proprietary chemical dosing at cw system, including material supply & service, for one year at stage-1&2, sgtpp , scale inhibitor for cw treatment ( pbtc ) , corrosion inhibitor for cw treatment ( zinc sulphate ) , polymalic acid, polymeric dispersant for hardness stabiliser ( pma & ter polymer ) , bio dispersant for cw treatment ( eopo ) , non oxidizing biocide for cw treatment ( qac, quarternary ammonium compound ) , non oxidizing biocide for cw treatment ( 10% dbnpa,(2,2-dibromo-3-nitrilopropionamide) ) , cw chemical treatment job of stg-1 & 2