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Its been a long time since I had the impeller out of my AC filters, I want to say the shaft is a ceramic, not metal. The only metal would be in the mag drive itself, but it's sealed so water doesn't get into that part. I'd be very suprised if any filter using metal parts wasn't using a stainless grade steel, even in regular tap water plain steel will rust pretty quickly, adding salt would just make it happen a little faster.
 
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