Fwiw pouring down rain right now and no inturruption of service.
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I was at a hotel and needed a 256MB file and the download time was going to be an two and a half hours!!! I had my wife get it for me at work to pull out the two files I needed. When I got home I downloaded the file and it took about 5 min.
Just don't let it go too long, or it will pick up metallic off-flavors. I'd keep a really close eye on it.
I wonder how much contact time you need. Coul adding a piece of copper to the racking cane work.
Also, aren't pennies made mostly of zinc now a days?
Do you have any copper on the hot side in your system? Might help reduce it, but the yeast may still produce more.