What is physically happening when a salt cell goes bad?

I've been getting sent out quite a bit lately to acid wash salt cells only to find that they are being misdiagnosed. Usually it is a bad connection on one of the wires on the cell. I suspect that there have been a lot of salt cells that have been acid dipped over the years because of a bad diagnosis.

These frequent service calls got me thinking about how to tell that a salt cell needs to be acid washed, and when the cell's life is over and needs to be replaced.

My understanding is...

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