Overflow box size?

Ratpack · 06-12-2008, 05:11 PM

I have a pump that according to the head loss calculator will be putting out about 950 - 1000 gph. So my question is, do I buy a overflow rated for 900gph and throttle the pump back (if I indeed get that much flow) or get one rated at 1000gph?

**Poseidon** · 06-13-2008, 07:17 PM

I'd get one rated for 1200gph or more.

***Reefland*** · 06-13-2008, 08:16 PM

I agree, get the overflow so that it is over-rated for the pumps output. No need to lose any of the pump output and the overflow should alwats handle a few hundred gph over the pump.
Posted via Mobile Device

Ratpack · 06-13-2008, 10:52 PM

Thanks, now one more question. The tank is a 75g and the sump is 30g, is 1000gph too much flow for that set up?

smpolyp · 06-14-2008, 01:44 AM

As long your returns are placed well you will be fine. Depending on your coral you may need some more or less.

**Poseidon** · 06-14-2008, 09:36 AM

I was running about that through my 90 with a 30 gallon sump, so I think you will be fine. I had a MAG12 as a return pump, and was able to run it wide open.

06-12-2008, 05:11 PM	#1
Ratpack Council Join Date: Oct 2007 Location: Lexington, SC Posts: 285	Overflow box size? I have a pump that according to the head loss calculator will be putting out about 950 - 1000 gph. So my question is, do I buy a overflow rated for 900gph and throttle the pump back (if I indeed get that much flow) or get one rated at 1000gph? __________________ Tim

06-13-2008, 07:17 PM	#2
Poseidon Moderator Join Date: Sep 2001 Location: Swartz Creek, MI Posts: 6,526	Re: Overflow box size? I'd get one rated for 1200gph or more. __________________ Need a Photographer? Just say NO to CRABS Mike

06-13-2008, 08:16 PM	#3
*Reefland* Owner Join Date: Feb 2000 Location: Bardstown, KY Posts: 13,176	Re: Overflow box size? I agree, get the overflow so that it is over-rated for the pumps output. No need to lose any of the pump output and the overflow should alwats handle a few hundred gph over the pump. Posted via Mobile Device

06-13-2008, 10:52 PM	#4
Ratpack Council Join Date: Oct 2007 Location: Lexington, SC Posts: 285	Re: Overflow box size? Thanks, now one more question. The tank is a 75g and the sump is 30g, is 1000gph too much flow for that set up? __________________ Tim

06-14-2008, 01:44 AM	#5
smpolyp Tenant Join Date: Feb 2003 Location: orlando Posts: 57	Re: Overflow box size? As long your returns are placed well you will be fine. Depending on your coral you may need some more or less.

06-14-2008, 09:36 AM	#6
Poseidon Moderator Join Date: Sep 2001 Location: Swartz Creek, MI Posts: 6,526	Re: Overflow box size? I was running about that through my 90 with a 30 gallon sump, so I think you will be fine. I had a MAG12 as a return pump, and was able to run it wide open. __________________ Need a Photographer? Just say NO to CRABS Mike

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