What are water treatment processes?

what’s the process of water treatment in pharmatheutical company ,
what’s the different between purified water and WFI ?

Please refer following guidelines on Water for pharmaceutical use,

  • WHO good manufacturing practices: water for pharmaceutical use, Annex 2, (TRS- 970, 2012)
  • WHO good manufacturing practices: water for pharmaceutical use, Draft- May 2020
  • Guideline on the quality of water for pharmaceutical use, by EMA- July 2020