Just one thought.. The jets in my hot tub failed after a while (many years of use), which is not what I would be worried about, but when they came apart, they used steel ball bearings to support the inner part that spins. It was a pain to clean up out of the hot tub, so I can't imagine the fun of cleaning them up in a reef. But the bigger point is, I'm not sure I would be comfortable putting metal into a tank. I know its not copper or anything, but do you really want to take that chance ? So I would at least take a close look, or maybe break down one to check it out ?
Just a thought...