Impeller Failure

I think the impeller has failed in my 1997 Ski Nautique, even though it was changed two years ago. (PCM 5.8L GT-40 engine, 450 hours) I ran the shower for the first time this season and I suspect some of the rusty water in the system went back toward the pump damaging or jamming the impeller. Or maybe the failure is just a coincidence. Regardless, no fresh water is drawn in through the clear and unobstructed Sherwood line strainer. So I’m guessing impeller failure. It's a bummer because I just started poking into -22; as is the case most every July!