Everything you always wanted to know about pharmaceutical waters and the ISPE – but perhaps never dared to ask. This session offers a comprehensive introduction to the fundamentals, current developments, and practical challenges related to the production, quality assurance, and regulation of pharmaceutical water systems. At the same time, participants gain a clear overview of the role of ISPE, its guidance documents, standards, and its contribution to harmonizing global best practices. The goal is to provide both newcomers and experienced professionals with valuable orientation and practical knowledge for daily operations.