Certified Instrument Specialist (CIS) Practice Exam 2025 - Free CIS Practice Questions and Study Guide

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What should be avoided when preparing water for instrument sterilization?

Using de-ionized water

Using distilled water

Using hard water

Using hard water for instrument sterilization should be avoided because it contains high levels of minerals such as calcium and magnesium. These minerals can lead to scaling and residues on the instruments, which can interfere with the sterilization process and may not be effectively removed after the sterilization cycle. Additionally, hard water can create an environment where minerals adhere to the instruments, potentially leading to contamination or ineffective sterilization.

In contrast, de-ionized water, distilled water, and purified water are all suitable choices for preparing water for instrument sterilization. These types of water have been treated to remove impurities and minerals, making them ideal for ensuring that the sterilization process is efficient and effective, and preventing any residues that could affect the functionality of the instruments.

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Using purified water

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