United States
Hong KongThe three-compartment sink, step by step
Scrape, wash at 43°C (110°F) minimum, rinse in clean water, sanitize either chemically or by immersion at 77°C (171°F) for 30 seconds, then air dry. Towel drying undoes the sanitizing step and is the most commonly missed answer.
Five steps, three sinks. The mismatch is what makes people fumble the order under exam conditions.
| Step | Where | Detail |
|---|---|---|
| Scrape | Before the first sink | Remove leftover food and pre-soak where needed |
| Wash | Sink 1 | Detergent, 43°C (110°F) minimum |
| Rinse | Sink 2 | Clean water, to remove detergent |
| Sanitize | Sink 3 | Chemical solution, or hot water immersion at 77°C (171°F) for 30 seconds |
| Air dry | On a rack | No towels |
Air drying is the answer
If you remember one thing, remember this one. A cloth reintroduces exactly what the sanitizer removed, and the step is skipped constantly in real kitchens because racks take space and service does not wait.
The exam knows that. Questions describing a busy cook towelling off plates are testing whether working practice or the Code is your reference point.
The setup around it
- A drainboard or equivalent space on both ends, for dirty items in and clean items out.
- Each compartment large enough to fully immerse the largest item.
- Water changed when it is visibly soiled, when the temperature drops, or when the sanitizer concentration falls.
- Test strips matched to the sanitizer, used regularly rather than once at the start.
- A thermometer for the wash water.
The point about changing the water appears in questions more than you would expect. Wash water full of grease is not washing anything, and diluted sanitizer is not sanitizing.
Chemical sanitizing runs at the concentration and contact time for the chemical. Hot water immersion is 77°C (171°F) for 30 seconds. Mixing the two sets of numbers - a chemical contact time with an immersion temperature - is a common wrong answer.
Why the order cannot change
Sanitizer does not work on soil. Detergent left on a surface interferes with the sanitizer. Each step prepares the next, so any reordering breaks something downstream.
Which is why an answer option that sanitizes before rinsing is wrong even though it sounds thorough.
When a dishmachine is used instead
The same logic, mechanized. A high-temperature machine must reach 71°C (160°F) at the utensil surface - the gauge on the front is not that measurement, which is why an irreversible temperature indicator strip exists. A chemical machine dispenses sanitizer at the label concentration.
Items still air dry. Machines are usually better at that than people are.
Common questions
What are the steps for a three-compartment sink?
Scrape, wash at 43°C (110°F) minimum, rinse in clean water, sanitize, then air dry. Five steps across three sinks, and air drying is the one most commonly skipped.
Why can you not towel dry dishes?
A cloth reintroduces exactly what the sanitizer just removed. Air drying on a rack is the required final step, and questions describing a cook towelling plates are testing this specifically.
What temperature for hot water sanitizing?
77°C (171°F) for 30 seconds by immersion in the third compartment. A high-temperature dishmachine is different: 71°C (160°F) measured at the utensil surface.
How often do you change the water?
When it is visibly soiled, when the temperature drops below the minimum, or when the sanitizer concentration falls below range. Greasy wash water is not washing and diluted sanitizer is not sanitizing.
Can you sanitize before rinsing?
No. Detergent left on a surface interferes with the sanitizer, so rinsing has to come first. Each step prepares the next, which is why the order cannot be rearranged.