I think some pumps fail because of handling and abuse .i know mine I keep in a bucket of lava rock and I think that may be what helps a pump last longer .It does not have to work as hard if you keep it clean .I had a becket pump i did not protect it was in a stock tank and it burned out because a small stick got stuck in the impellar and it was like the size of a tooth pick but longer and it got through the cage and i never use those foam filters .I was going to put it in a crate or bucket and just forgot .It was a pump I got from an abandoned pond i took out ,so free .But still should not have happened .