bids are invited for annual maintenance services for water purification and conditioning system (version 2) - potable water purification system with inbuilt water cooler.; 10 and above; package-5 : water purifier and conditioning system maintenance involving basic servic.. - operation & routine maintenance of the entire system of ac units, drinking water fountains, water coolers & ro water purifiers as provided in scope of work including day to day maintenance as required as per good engineering practice, recommendation of the manufacturer, instructions of engineer-in-charge by providing following manpower on all days with weekly off and excluding reliever:- skilled manpower:- 02 nos.