I would like to get a new waterfall pump (PowerJet WG 10,000... 137 watts @
2900 GPH). It seems to be a pretty energy efficient pump for the flow. It
has an 1 1/4" discharge. My question is that should I use an 1 1/4" pipe
from the discharge or actually use a 2" pipe, as maybe this would be more
efficient for the pump.

- Francis