What size tank and how much flow are you talking about? I have a 120 AGA RR and it has two 1" drains using 1 1/4" standpipes and two 3/4" returns and I am flowing about 600 GPH.
The water flow calculators on the lower left side of the Reef Central home page will help you out. I believe that the following rules should apply:
• Drain capacity > return pump capacity
• Overflow grating capacity > return pump capacity
Per the Drain/Overflow Size Calculator (http://www.reefcentral.com/calc/drain.php), each 1†drain should give you 600gph for a total of 1200gph. I don’t know what flow rate your overflow grating permits but my Megaflow permits ~800gph.
You can use the flow calculators to determine your return rate through a ¾†opening versus a 1†opening to see which diameter you should use.
My advice is to use the larger opening (1â€Â) and get a smaller and quieter pump. If you still need to increase flow, use in-tank flow devices like a Vortech. If you need to reduce return flow, you can always use a PVC fitting to neck down the opening.
<a href=showthread.php?s=&postid=8784682#post8784682 target=_blank>Originally posted</a> by PLNelson
Is it OK to limit the flow of the drains with vlaves?
I have an Iwaki MD-30RXT. The flow is great (~800gph) but my family thinks it's too noisy. So I'm looking for a slower but quieter return pump supplemented with in-tank flow devices.
I’d consider an Eheim 1260 return pump if I can figure out where to get a bulkhead or adapter for its BSPP threads. I’d also consider a couple of Vortech in-tank propellers once a controller is developed for them.
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