On Mar 24, 2:01*pm, wrote:
On Mar 24, 2:02*am, Bob Hoover wrote:

I'm leaning toward that myself. When the tubes came out of the acid, I
rinsed them in clean tap water and then let them air-dry. I actually
watched them rust in a period of 5 minutes.

Harry

Another thought - I've seen some EMT that has been painted/coated on
the inside. The acid won't remove that. If that is the kind of EMT
you are using for practice burn out the paint and then use a wire
brush from the plumbing section to clean it out.
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Leon McAtee