How big of return lines?

[mongoose]

I'm running an 1100GPH CL system also but I'm goin to have a Mag 950 running the fuge, how big should my return lines be on both in a 65G, I was thinking 1/2 or 3/4 I can't decide. Mag will be going through a SCWD also. What do you think?
maybe 1/2 on the mag and 3/4 for the CL system

 

[squidd]

1" on the closed loop pump and at least 3/4" on the Mag return pump...3/4" ID spa flex fits right on the SCWD "nipples"...
You will see huge gains in flow by going to the larger lines...
At least 1" on the intake lines...1 1/4" if you can fit it on the closed loop...

 

[mongoose]

Thanks Squidd....I didn't know that larger lines would result in greater flow, I'm just worried that if I go too big the flow will not reach the other side of the tank but with roughly 2060GPH Max Flow before head pressure and scwd are put on the system I would guess its not really going to be a problem.