What are the different grades of pure water used in a hospital, and which departments need each grade? Hospitals typically require three grades of purified water. Pretreated water (softened or carbon‑filtered) serves laundry, kitchen, and central sterilization. Type II pure water (reverse osmosis plus deionization, resistivity 1–10 MΩ·cm) is used for preparing reagents in clinical laboratories, feeding automated analyzers, and rinsing glassware. Type I ultrapure water (resistivity 18.2 MΩ·cm, with bacteria and endotoxin control) is essential for hemodialysis, pharmaceutical compounding, and sterile processing of surgical instruments. Some critical care units also need pyrogen‑free water for certain respiratory equipment. Matching the water grade to each application protects both patients and expensive hospital equipment. https://www.molewater.com/products/pure-water-system-for-hospital