are these the Rio hyper flow pumps that you guys are talking about? if so, have they been improved? i use to use the 1600gph pump but the impeller magnet would warp and would get stuck. the magnet part of the impeller was some kind of soft almost plastic feeling material. i must have a half dozen of them laying around in my basement. total piece of junk.... that's why i switched to Mag drive pumps.
Hy-Drives are made by Danner, same company that makes Mag Drive pumps.
I'm actually surprised they still make the mags as the hy-drives blow them out of the water.