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CRCST · Cleaning, Decontamination and Disinfection · 6 min read

Disassembly, Water Quality and Detergents

In this lesson you will
  • Explain the principles of instrument disassembly, sorting, and manual cleaning techniques in the decontamination area.
  • Differentiate between utility water and critical water according to ANSI/AAMI ST108 and describe the impact of water quality on device processing.
  • Identify detergent chemistries, enzyme functions, and dilution requirements to ensure safe, effective medical device decontamination.

Instrument Sorting, Disassembly, and Decontamination Safety

The sterile processing technician plays a vital role in patient safety by executing each phase of medical device reprocessing, which includes cleaning, decontamination, inspection, assembly, packaging, sterilization, and storage of instruments. Throughout every step of this workflow, technicians must strictly follow the manufacturer's instructions for use (IFU) and facility policy. Device reprocessing begins with point-of-use treatment to remove gross soil and prevent soil from drying; when devices arrive in the decontamination area, technicians sort them to protect personnel and delicate equipment. Sorting instruments in the decontamination area prevents damage to delicate devices and enhances cleaning efficiency. Disposable blades and suture needles should be removed and discarded in approved sharps containers at the point of use; technicians must use appropriate precautions to identify and safely handle any sharps that arrive in decontamination.

Delicate items require specialized handling to prevent costly damage. Technicians must separate microsurgical, ophthalmic, and other delicate instruments from heavier devices, utilizing protective trays or containers as directed by their IFUs. When arranging items, position heavy instruments so they cannot crush delicate items or obstruct cleaning, following tray and equipment IFUs. Hinged instruments, such as hemostats and scissors, must be fully opened and unlocked during the cleaning process so that all working surfaces are exposed to cleaning solutions and mechanical action. Powered surgical instruments, air hoses, and electrical cords must not be submerged unless specifically approved by their IFU. Similarly, technicians must handle rigid and flexible endoscopes according to their specialized cleaning IFUs, separating or protecting them from other instruments as required.

Multi-part instruments must be disassembled prior to cleaning according to the manufacturer's instructions for use. Disassembly exposes lumens, crevices, and mating surfaces so they can be cleaned as directed by the device's IFU. Because complex devices often include tiny screws, caps, or adaptors, small disassembled components should be secured in mesh containment baskets to prevent loss during processing. When a device may be immersed according to its IFU, perform manual brushing and scrubbing below the water surface to minimize splashing and aerosolization; clean nonimmersible devices as directed by their IFUs.

Exam tip. Certification exams frequently test how hinged and multi-part instruments are handled in decontamination. Remember that hinged instruments must always be fully opened and unlocked, and multi-part devices must be disassembled before cleaning to ensure cleaning solutions contact every surface.

Common mistakes

  • Submerging powered surgical equipment, air hoses, or electrical cords in cleaning basins without verifying that submersion is specifically approved by the manufacturer's IFU.
  • Adding extra detergent beyond the chemical manufacturer's recommended dilution ratio, which leaves harmful residues that can damage devices and harm patients.
  • Using highly alkaline detergents on anodized aluminum or susceptible metals without confirming permission in the device IFU.
  • Failing to inspect and size lumen brushes correctly, which risks incomplete contact along the accessible length of internal surfaces or causes device damage.

Key points

  • Multi-part instruments must be disassembled prior to cleaning to expose lumens, crevices, and mating surfaces, with small components protected in mesh containment baskets.
  • Clean hinged instruments open and unlocked, and perform manual scrubbing below the water surface when the device IFU permits immersion; follow the IFU for nonimmersible devices.
  • ANSI/AAMI ST108 defines utility water for preliminary washing and flushing, and critical water (produced via reverse osmosis or deionization) for final rinsing when required.
  • Water hardness, caused by calcium and magnesium, creates stains, scale, and reduces detergent efficiency, necessitating water monitoring and treatment.
  • Detergent dilution ratios must be strictly maintained; neutral cleaners offer wide compatibility, while alkaline and acidic cleaners require specific IFU authorization.
  • Protease, lipase, and amylase enzymes target proteins, fats, and starches respectively, but water exceeding recommended temperatures reduces their activity.
  • After decontamination, items must be inspected under adequate lighting, with magnification when needed or required by the device IFU, then assembled or left disassembled for sterilization as directed by the IFU.

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Original lesson written for CRCST practice · updated October 14, 2026. Exam names are trademarks of their owners; tests.global is not affiliated with them.