While Water for Injection (WFI) is often regarded as the purest process water in pharma, semiconductor industries operate at an even higher standard. Ultrapure water (UPW) used for chip manufacturing must be virtually free of all ionic, organic, and particulate contaminants—measured down to parts per trillion. Continuous operation, online analytics, and predictive control ensure stability and efficiency that pharma can learn from. Exploring UPW concepts helps redefine what “pure” truly means and reveals new pathways toward more sustainable and reliable pharmaceutical water systems.