Beverly, yes the impeller shafts, I believe they are stainless steel, and I've found they go black. I'm assuming this is a form of corrosion. I know they can get pretty slimely, I like the pro series because they have the ceramic shafts. Alot of people say they have had trouble with the Rio's but I never did, but that was still worrysome enough for me to move away from them.
Doug
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