Ask them to make the piping as straight as possible. Try to get it mandrel bent too if you can (more expensive, but better flow). Stainless steel will last longer than regular steel, but it is also much more expensive (harder to bend and weld). Regular steel will last about 2 years or so before rust takes it over.
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Project Sil-E: The New Black
In morning they will come alone
And we arise as if a new day's dawned for everyone
But now we know
As much as we don't show
OUR WORLD HAS BEEN BLACKENED!
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