Sanitizer Test Strips

Sanitizer test strips are chemical indicator strips used to check the concentration of a sanitizing solution. In restaurants and food facilities, they help staff verify that a prepared sanitizer is within the concentration range specified by the product label and applicable food-safety requirements. The test strip must be designed for the specific sanitizer chemistry being used.

Common types of sanitizer test strips

• Chlorine test strips: measure available chlorine within the range supported by the strip.
• Quaternary ammonium (quat) strips: measure quat concentration and are not interchangeable with chlorine strips.
• Iodine test strips: measure iodine-based sanitizer concentration using the appropriate indicator range.
• Other test methods: some sanitizer chemistries require specific test kits or instruments rather than ordinary paper strips.

How to use sanitizer test strips

1. Confirm the sanitizer product and the correct test-strip type.
2. Check the strip’s expiry date and storage instructions.
3. Prepare the sanitizer according to the manufacturer’s dilution instructions.
4. Dip or apply the strip exactly as directed, using the specified contact time.
5. Compare the colour with the chart under suitable lighting and record the result if required.
6. Adjust or replace the solution if it falls outside the approved range, then retest.

Why concentration matters

A sanitizer that is too weak may not work as intended. A solution that is too strong may leave excessive residues, damage surfaces or create a chemical hazard. Correct concentration is only one part of effective sanitizing; surface cleaning, temperature, pH and contact time also matter according to the product instructions.

Sanitizer strips versus ATP testing

Sanitizer test strips measure the concentration of the chemical solution. ATP testing detects organic residue on a surface and does not measure sanitizer strength or identify pathogens.

Chef’s tip: keep the correct test strips beside the sanitizer preparation area and train staff to test at the frequency specified by the operation’s procedure and product label.