We're in our 7th season of our salt pool, and haven't seen any degradation in either the stainless light bezel, nor the stone coping/waterfall. We do have a pronounced white line on the stone, which I suspect is more calcium build-up than anything. We haven't had to replace any equipment due to salt being a factor (knock on wood). Our deck is Kool-deck, and seems to be just fine, despite my grand kids efforts to empty 1/4 of the pool on it.

I'm in extreme Southern Az, where humidity is very low, year round with the exception of monsoon season.