Or an external pump like Little Giant

http://www.drsfostersmith.com/produc...=6&pCatId=4614

Most people who have had Little Giant pumps cringe when they the name being
recommended. The are infamous for the seals breaking/splitting, spilling
the oil inside into the pond/fishtank. It's a pain to clean up. I'd go
with a supreme pondmaster, or any of the magneticly driven pumps.

Hope this helps,
Bob