I have a small amout of rust on my SS nut, in my HLT. I just cleaned it off with a choreboy. I didn't notice it right away I'm sure since I don't pull apart my HTL that often all the water I use is pumped in. So I have probably brewed a few batches with it and tastes fine to me.
Primary: Pumpkin Pie
Secondary: Woods Pail Cider
On Tap: Woods Pale Ale, Double Citrus IPA, Blitzen Ale