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ChrisRD

Advanced Reefer
Location
Upstate NY
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1000 GPH will be fine for your closed loop. It's flow velocities that you don't want to be excessive, not flow volumes.

To figure out how your pump will perform under load check here:
http://reefs.org/pumps/

If you don't see your pump on the list, chances are the manufacturer has a pump curve published for it and you can get a good idea of what sort of flow rates to expect in your application by looking at that...
 

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