closed loop help

trigger05 · 01/14/2008, 01:30 AM

I recently bought a cube tank that was already drilled.
I wan to run a closed loop system, however there is a hole drilled that i do not need.

as ilustrated, i have the intake and outpu figured out, however i do not know what to do with the hole in the center.
What do you guys recomend i do?

STsONpERs · 01/14/2008, 01:52 AM

hole is the center in the intake to the pump, the other four holes are for the return.

The previous owner was probably using a Oceanmotions device.

Is the green hole 1.5" and the other 1" or 1" and the others 3/4"

trigger05 · 01/14/2008, 08:07 PM

They are all 3/4"
however i have two pumps to use for the closed loop

AZDesertRat · 01/14/2008, 08:15 PM

I would use the center hole for the intake for a closed loop. Use the two red ones for the closed loop returns and the two blue ones for the sump returns.
My closed loop has a center drilled hole very similar to that one and it works great.

trigger05 · 01/14/2008, 11:46 PM

i have 2 quietone 3000 pumps that i will be using
for the closed loop. At 780 gph each, that gives me a total of 1560 gph. The tank is 40 gallons, so this will give me turnover rate of 39xper hour.
is this too much? i want to keep sps corals

AZDesertRat · 01/15/2008, 09:44 AM

Probably not too much. I have about the same turnover in my 100G between 2x#4 Koralias, a OR 3500 closed loop with a Oceans Motions Squirt and a OR 3500 return pump.

Watch your pumps closely. I had a Quiet One 4000 on my closed loop originally until one day i noticed my chiller running non stop and the tank temperature still rising. I checked each pump individually and found the 4000 had shorted out, was electrifying my tank and was so hot you could not touch it. Needless to say it went in the trash and was replaced by a OR 3500. I don't know if this is a common problem wit QO pumps but it got my attention. I did notice after replacing it the chiller did not run as often as it did even when the QO was functioning properly. I also found the OR handled head or backpressure better since at the time I had a SQWD on the loop and it switched more often and had more velocity through the returns. The QO pumps also have problems restarting after power outages so watch that too. I found the 4000 needed more frequent cleanings and had to pay partciular attention to the bottom end of the impeller magnet and deep in the housing where the shaft inserts as calcium really built up on those two points.

01/14/2008, 01:30 AM	#1
trigger05 Registered Member Join Date: Apr 2006 Location: Los Angeles, California Posts: 390	closed loop help I recently bought a cube tank that was already drilled. I wan to run a closed loop system, however there is a hole drilled that i do not need. as ilustrated, i have the intake and outpu figured out, however i do not know what to do with the hole in the center. What do you guys recomend i do?

01/14/2008, 01:52 AM	#2
STsONpERs Registered Member Join Date: Oct 2004 Location: MN Posts: 395	hole is the center in the intake to the pump, the other four holes are for the return. The previous owner was probably using a Oceanmotions device. Is the green hole 1.5" and the other 1" or 1" and the others 3/4"

01/14/2008, 08:07 PM	#3
trigger05 Registered Member Join Date: Apr 2006 Location: Los Angeles, California Posts: 390	They are all 3/4" however i have two pumps to use for the closed loop

01/14/2008, 08:15 PM	#4
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	I would use the center hole for the intake for a closed loop. Use the two red ones for the closed loop returns and the two blue ones for the sump returns. My closed loop has a center drilled hole very similar to that one and it works great.

01/14/2008, 11:46 PM	#5
trigger05 Registered Member Join Date: Apr 2006 Location: Los Angeles, California Posts: 390	i have 2 quietone 3000 pumps that i will be using for the closed loop. At 780 gph each, that gives me a total of 1560 gph. The tank is 40 gallons, so this will give me turnover rate of 39xper hour. is this too much? i want to keep sps corals

01/15/2008, 09:44 AM	#6
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	Probably not too much. I have about the same turnover in my 100G between 2x#4 Koralias, a OR 3500 closed loop with a Oceans Motions Squirt and a OR 3500 return pump. Watch your pumps closely. I had a Quiet One 4000 on my closed loop originally until one day i noticed my chiller running non stop and the tank temperature still rising. I checked each pump individually and found the 4000 had shorted out, was electrifying my tank and was so hot you could not touch it. Needless to say it went in the trash and was replaced by a OR 3500. I don't know if this is a common problem wit QO pumps but it got my attention. I did notice after replacing it the chiller did not run as often as it did even when the QO was functioning properly. I also found the OR handled head or backpressure better since at the time I had a SQWD on the loop and it switched more often and had more velocity through the returns. The QO pumps also have problems restarting after power outages so watch that too. I found the 4000 needed more frequent cleanings and had to pay partciular attention to the bottom end of the impeller magnet and deep in the housing where the shaft inserts as calcium really built up on those two points.