double overflow

i just purchased a used double overflow and am wondering what size return pump is need for it.. it says aqualine on it not much luck looking for its specs

 

what size tank??? that is the biggest factor in choosing a return pump

 

i have a 55gal with a 30 galon sump i just bought with the overflow

 

I couldn't find any specs (gph) on aqualine dual overflow either. I would assume being a dual overflow it would at least be around 600gph. I like mag drive pumps,they have been good to me. The mag 5 is rated for 500gph and the mag 7 at 700 gph. I have a 55gal with a 20gal long sump/fuge and my overflow is rated for 1000gph so I use the 9.5 mag and it worked out perfect. If you get a pump thats pushing too much water that your overflow can handle you can always tee off your return line and run it back to your return in sump and put a ball valve in it. That way you can decrease your flow to your tank to where it equals out with the overflow without restricting your pump.