Yeah, you see that a lot with rivertank & manifold setups...burnt out powerheads within weeks. Obviously your water is not moving quite that fast, so the effect is less, but I'd imagine your pump would be tougher to replace than a powerhead. Fast moving water wears pumps down really fast for some reason. I'm not an engineer, but I know you see the same thing when pumping air. Maybe a sheet of (my favorite!) plastic knitting mesh would slow it down a bit? Just kiddin