What critical water is used for (AAMI ST108)

CRCST practice question · Cleaning, Decontamination & Disinfection

ANSI/AAMI ST108 describes two main categories of water used in device processing. What is critical water typically used for?

  • A. Pre-rinsing gross soil from instruments when they first arrive in decontamination
  • B. Filling the hand-washing sinks and eyewash stations in the decontamination area
  • C. The final rinse and other steps where water quality can directly affect the device or patient
  • D. Cleaning the floors and work surfaces in the decontamination area each day

Answer

C. The final rinse and other steps where water quality can directly affect the device or patient

Critical water is extensively treated, often by reverse osmosis or deionization, to reduce microorganisms, endotoxins, and minerals, and it is used primarily for the final rinse. Utility water, which is mostly tap water that may need further treatment, is used for flushing, washing, and rinsing steps earlier in the process.

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