How to Use a 3-Compartment Sink

A three-compartment sink separates manual warewashing into distinct stages: wash, rinse, and sanitize. Before starting, clean and sanitize the sink compartments and drain boards, and scrape or remove food debris from the equipment and utensils.

The five-step workflow is: preclean, wash, rinse, sanitize, and air-dry.

1. Preclean the items

Scrape food debris into a waste container. Presoak or preflush items when necessary so the wash solution can reach the surfaces that need cleaning.

2. Wash in the first compartment

Wash with a clean detergent solution maintained at no less than 110°F (43°C), or at the temperature stated on the cleaning agent’s label. Replace the solution when it becomes dirty or no longer cleans effectively.

3. Rinse in the second compartment

Rinse with clean water so that loosened soil, abrasives, and cleaning chemicals are removed or diluted. Change the rinse water when it becomes dirty or full of suds.

4. Sanitize in the third compartment

Use one of these methods:

• Chemical sanitizer: Mix and use an approved food-contact-surface sanitizer according to its label, including the required concentration, temperature, and contact time. Verify the concentration with the correct test kit or other device and use that test method according to its instructions.
• Hot-water sanitizing: Immerse items in water maintained at 171°F (77°C) or above for at least 30 seconds.

Safety: Manual hot-water sanitizing requires equipment designed for that purpose, including a rack or basket that permits complete immersion. Because 171°F water can cause serious burns, follow the establishment’s procedures and local regulatory requirements.

5. Air-dry

Place sanitized items so they drain and air-dry completely. Do not towel-dry them. Store them only after adequate draining and drying, in a clean location protected from contamination.

Check the rules that apply to your kitchen

This guide follows the FDA Food Code 2026, including sections 4-501.19, 4-501.111, 4-501.116, 4-703.11, and 4-901.11. The Food Code is a model used by jurisdictions, so follow the rules adopted by your state or local authority and the manufacturer’s label for every cleaner and sanitizer.

Related kitchen-safety lesson

For safe handling and cleaning of sharp tools, read the kitchen knife-parts and care guide. Never leave a knife hidden in a warewashing sink.