California Barber Written ExamSafety and HealthHard
A barber is using a disinfectant solution in a wet sanitizer. The manufacturer's instructions state that the solution must be changed daily or if it becomes visibly cloudy. If the solution was prepared at 9:00 AM on Monday, and it is now 2:00 PM on Tuesday, and the solution appears clear, when must it be changed, at the latest?
- ABy 9:00 AM on Tuesday.
- BIt should have been changed already.
- CIt can be used until it becomes cloudy.
- DBy 9:00 AM on Wednesday.
Show answer & explanationAnswer & explanation
Correct answer: B. It should have been changed already.
The manufacturer's instructions state 'daily OR if it becomes visibly cloudy.' This means the solution must be changed every 24 hours regardless of its appearance. If prepared at 9:00 AM on Monday, it should have been changed by 9:00 AM on Tuesday at the latest, even if clear. Since it is 2:00 PM on Tuesday, it should have already been changed.
Why the other options are wrong
- A. This is the correct latest time based on the 'daily' requirement, meaning by 9:00 AM Tuesday.
- C. This ignores the 'daily' change requirement, which is a maximum 24-hour use period.
- D. This would exceed the 24-hour daily change requirement.
Disinfectant Solution Change Frequency
Disinfectant solutions must be changed according to manufacturer's instructions, which typically specify a daily change or sooner if visibly contaminated, to ensure efficacy.
- Daily means every 24 hours.
- Cloudiness indicates contamination and requires immediate change.
- Failure to change compromises disinfection and violates regulations.
Memory trick: Time or grime: change the solution, don't delay.