I can't help with the dishwasher questions, as I AM the dishwasher in our house. However, the pot your describing sounds like enamelware. I am currently using a large enamelware canning pot because it's what I have. It's my understanding that they are OK to use as long as there is no pitting or chipping of the enamel that exposes the metal underneath. Apparantly this metal can give an off-taste to your brew. My pot seems to be OK so far; two batches and no off flavors, but I check it before use to make sure there are no chips or scratches.