Reasonable design of storage tank volume, accurate selection of pump flow and shut-off head, reasonable design of sampling points, pipeline direction and slopes The PW (purified water) distribution system adopts pasteurization process. Through heat medium heating, the system reaches an ideal temperature for sterilization. The appropriate time duration of sterilization guarantees the best results. No other substances are added to the system in order to prevent contamination from other sources. The WFI (water for injection) distribution system uses superheated water for sterilization. The system reaches the sterilization temperature through heated medium heating. The appropriate time duration of sterilization guarantees the best results. No other substances are added to the system to prevent contamination from other sources.