Molten Aluminum and its Alloys are generally subjected to Degassing and Grain Refining before casting.Degassing is carried out to reduce the Hydrogen gas content. On-line Degassing is among the popular practice and is carried out with the help of equipment like SNIF, LARS etc.Grain refining is carried out for improving the micro-structure of the cast product. It involves addition of grain refiner in to the melt prior to or during the casting.Utility Patent applied vide this non-provisional patent application envisages addition of powder/s of Degasser(Hexa-chloro Ethane), as a substitute for Chlorine and/or Grain refiner; into the purging gas of an On-line Degassing system; thus accomplishing degassing and/or grain refining in one single stage with improved efficacy of respective treatments, better working conditions and lower processing cost.This invention can be adopted in any existing as well as new On-line Degassing systems.