Tender For providing of annual maintenance services for water purification and conditioning system (version 2) - potable water purification system with inbuilt water cooler.; 5 to 7; package-5 : water purifier and conditioning system maintenance involving basic servicing, f..,annual maintenance services for water purification and conditioning system (version 2) - potable water purification system with drinking water cooler; 5 to 7; package-5 : water purifier and conditioning system maintenance involving basic servicing, f..