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And if there is ANY stainless involved, with the OP's process, chromium is likely present in the process, and the the current federal water limits I believe for toxicity is, wait for it, 0.00ppb.
You and I are the only ones who have even mentioned the complications of cadmium, the rest?

The arrogance of ignorance maybe comforting to some, but trying to understand a process beyond the immediate concerns of rust removal, I guess for many requires too much responsibility.



The arrogance of ignorance, lol. Mirror, perhaps?

STAINLESS STEEL. If you have enough rust on STAINLESS STEEL to need muriatic acid to clean it, well then it's not STAINLESS STEEL. Point is moot, if not a strawman.

Cadmium plating? That's there to do what? Prevent rust. Rust means it's not there, if it ever was. Another moot point, if not again a strawman.

Explain to us how this would be any different than sand blasting the crud off? How to you dispose of that?

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.