It depends on what sanitizer you intend to use in the foot baths, it looks like you've been focusing on chlorine, which would be fine, however you run the risk of bleaching all your employee's clothes and concentration will degrade quickly.
I'd recommend a QUAT based sanitizer for foot baths as it will leave a residual on the shoes and degrade less quickly. Reach out to a chemical supplier, and the product itself will have a recommended concentration on the label or provided by the seller. You can then look up a test strip/kit that will let you verify the concentration is at the level you want it to be.
Remember that foot baths need to be changed frequently throughout the day to prevent them from actually contributing to problems.
QA Manager and food safety blogger in Oregon, USA.
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