If you want a pump that will be acting as your return/ circulation pump, a mag drive 18 would be ill advised.
Try Champion lighting/ or Drs. Fosters Smith for some great high head pumps.
If you want the pump for just pumping saltwater/ RO water from a reserve tank, the mag drive 18 MIGHT cut it.
You may also inquire to Tom Obrect. He has a Display Tank upstairs, and a Sump room downstairs.
Good Luck!