600 Gallon Return Pump Solution Needed

[jda]

I only used a single pump for a return around 3000 gph, but then a 7500 for a closed loop on oceans motion 4 way.

 

[ScottieB]

I'm re-plumbing my 300 to a basement sump, since I had an old/unused reef flo pump I just sent in in to them for tune-up and repair. I sent it in, they refurbished the seals the motor and sent it back (for a fee) now it works like new. Figured I could use it or keep it as a back up. No matter what you choose for a pump, might be worthwhile having it as a backup at least.
Here is the info that: http://www.reeflopumps.com/pump-repair.html

Good luck with the rest of your setup!