Mag 500 gph pump
Pondmaster Pond-Mag 500 GPH, 5 Year Warranty. Ships Free!
All pumps have a GPH rating based at 0'. The higher up you're trying to pump water the less pressure you will have.
Here is a rough calculation of how a 500 GPH pump will perform
|Flow @ 1'||Flow @ 3'||Flow @ 5'||Flow @ 7'||Flow @ 10'||Flow @ 15'||Shut off|