Hi Guys
I have an Eheim 1052 Aquarium pump i bought in approximately 1987 possibly 88 and it's still running perfectly on my s a l t water Reef tank. (had to space word :-/)
only replace impeller spindle once in that time
because it broke when i was cleaning it (i dropped it & it's ceramic) there was no visible wear on the spindle at all.
this pump was run continuously apart from about a month when i moved house.
Regards
Rick