Water is a component of every pharmaceutical product, so water system must be validated to ensure the consistent production of high quality water. The pharmaceutical industry places a high priority on the quality of water used in production of finished product, intermediate reagent preparation and analytical processes and especially in case of parenteral products where quality of water must be as per Pharmacopoeia.According to WHO TRS 937 and EU Guideline, critical quality impacting systems such as water system should be qualified and validated. Here qualification should be performed before...