Pumps push. Never pull.
True true but I decided to go with a Little Giant 3 MDQX SC here and what a horse of a pump! Flow is not an issue used as a return pump on my DIY sump. In 3yrs I checked the impeller housing twice and regretted it. Checked twice and it was clean except for tannin staining both times and no wear.
* remember to drop oil on the bearings