12.2.5 Cleaning and Sanitation - Correct Concentration

Part vi and vii Reference Methods to confirm the correct concentrations of detergents and sanitizers and the responsibility & methods used to verify the effectiveness of the cleaning and sanitation. 

What can we do to confirm correct concentrations? 

To confirm the correct concentrations of detergents and sanitizers, we use a combination of validated methods including test strips or colorimetric kits for quick checks (e.g., chlorine, quat, peracetic acid), titration kits for more precise measurement of cleaners, and digital meters such as ORP or conductivity meters where applicable. These methods are matched to the specific chemical in use and follow manufacturer guidelines. We also routinely verify and calibrate our chemical dispensing systems to ensure accuracy. The sanitation team is responsible for preparing and applying the solutions correctly, while the QA team conducts independent verification and documentation. Effectiveness of cleaning and sanitation is confirmed through visual inspections, ATP testing, allergen and protein residue swabs, and microbiological surface testing. These combined methods ensure both proper concentration and efficacy of the cleaning process in compliance with our food safety program.

Your chemical supplier should also supply titration kits for testing concentration.  While conductivity meters and flow can help, they're not as accurate and you should use a titration method to check on a risk assessed basis.

When you're deciding where to check and how often, do consider where you dilute your chemicals.  If it's in one place you will need to do fewer checks than if you have multiple dilution stations.  Also when taking a sample, allow it to run for a minute or so first so it's representative.

These are the kind of test kits they supply:  Chemical Titration Test Kits

Depending on the contractor, in the UK at least, some of the suppliers will do this testing for you (depending on how often they're on site as well).  Not sure if that's also the case in the states but worth asking.

Yeah, just ask your supplier, mix accordingly, use whatever test strips or method they recommend.    I use strips, which are easy and any auditor is happy with.   Test once a week, keep a log, sign off on it.