Quote:
Originally Posted by salty210
I would just go with the 1/2" return, your not gaining anything going bigger pump will only pump what it can.
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This is a completely false statement. Pumps will often have smaller intakes and outputs to reduce cavitation and other pressure differential effects but this is independent on the requirements for the pipe network. As stated the larger the diameter of the pipe the less friction. Less friction means more flow. Pipe friction is a major contribution to head loss and you can easily double your flow rate by using 1" pipe over 1/2" pipe.
Also +1 on not using a check valve.