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PPriority · FDA Food Code 4-501.114 · 24-72 hours (Priority)

How to fix: Improper Sanitizer Concentration

Chemical sanitizer solution was too weak to kill pathogens or too strong to be safe, making sanitizing steps ineffective.

What this violation means

FDA Food Code 4-501.114 requires chemical sanitizers used on food-contact surfaces to be maintained within approved concentration ranges — chlorine-based sanitizers must be 50–200 ppm, quaternary ammonium at 200–400 ppm, and iodine at 12.5–25 ppm. A solution that is too weak will not kill bacteria and viruses remaining on surfaces after washing; one that is too strong can leave toxic residues on food-contact surfaces. Sanitizer concentration must be tested with appropriate test strips each time a solution is prepared.

Step-by-step: how to fix this before re-inspection

1Discard all active sanitizer solutions and mix fresh batches at the correct concentration before re-inspection
2Test the new solution with test strips to confirm it falls within the approved range
3Recalibrate or repair any automated dispenser that produced an out-of-range concentration
4Train all dishwashing and prep staff on the required ppm range and how to use test strips
5Post the approved concentration range and test-strip procedure above the three-compartment sink

What the inspector rechecks at re-inspection

WHAT THE INSPECTOR CHECKS

Inspectors do not just look at the surface. For this violation, expect them to verify:

☐Tests sanitizer solution concentration with test strips at every active sanitizing station
☐Checks that test strips are present, unexpired, and match the sanitizer type in use
☐Verifies sanitizer dispenser or mixing ratio is set correctly
☐Confirms employees know the required concentration range for the sanitizer being used
☐Reviews the three-compartment sink setup: wash, rinse, sanitize in the correct order

How to prevent this violation from recurring

Test sanitizer concentration at the start of every shift and after any solution change
Keep test strips within reach of every sanitizing station
Replace sanitizer solutions every 4 hours or sooner if they become visibly soiled

Related violations to check

No Sanitizer Test Strips Available→Food-Contact Surfaces Not Sanitized Between Uses→
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This document is for informational purposes only. It is not legal advice and does not guarantee a passing re-inspection score. Always verify requirements with your local health department. Fix steps are based on FDA Food Code 4-501.114; individual jurisdictions may have additional requirements.

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