If you use 2" piping to the falls, your resistance will be less and your
pump will be more effective, despite the 1 1/4 exit.

Jim

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____________________________________________
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"Francis" wrote in message
. rogers.com...
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