My facility is interested in beginning production of a 70% organic ("made-with-organic...") version of our product along side our non-organic product (parallel operation). We use a salt in our non-organic product that contains YPS, a prohibited substance in organic products. We mix the salt into a slurry in a mix tank that would also be used to mix the organic slurry. To perform a change-over currently, we empty the lines & perform a water rinse of the tank & lines, followed by a rinse with oil, an then another water rinse. After speaking with a certifying agency, they said that that same change-over process would likely be okay for changing over to organic product as long as we validate it. This is where I get stuck.
Would ATP swabbing, considering the ingredients going into the tank (refined oil + others), be applicable for this situation or is there another rapid test that can be performed to ensure no prohibited substances remain for organic production?