I'm addressing a couple items that came up in my lab's recent audit for New York state Legionella testing procedures and I'm wondering if anyone knows what they're referring to.

We were told to complete a moisture weight loss study of the plates we use inside candle jars during incubation. I have scoured through the NELAC standards, ISO 11731, ISO 11133 and the internet and have only found things related to drying grain. Even a ctl-f search for "moisture" came up with nothing. ISO 11133 only mentions ways to keep the plates moist during incubation, which we do.

Have you ever encountered something like this? How did you set up the study and how did you present the results (in either SOPs, Quality Manual, etc) ?