Mag 18 overflow

Woodchuck12 · 12/26/2011, 05:02 PM

I just ordered a mag 18 for my sump. Will the Glass Holes 1500gph overflow work with this?

redfishblewfish · 12/26/2011, 05:09 PM

Check out your head loss HERE.

Woodchuck12 · 12/26/2011, 08:24 PM

When I checked it, it looked like the loss would be way less than the 1500 that the overflow would use. Is there a valve that could be used to reduce the overflow to equal the pump? Sorry if these a dumb questions, but I am new to this.

EDIT: Never mind, I just found another thread explaining that the overflow just needs to be bigger than the return pump gph wise. But, just to check, the mag 18 after head reduction, should work with the glass holes 1500 gph overflow. Right?

Triton_Z · 12/26/2011, 08:52 PM

It should be a decent match as you are going to lose some flow with your head loss. I would plan on putting a gate or ball valve on the output of the pump to allow you to adjust the flow coming out of your return pump. Don't restrict the overflow plumbing with any valves or too many restrictions (elbows, etc).

You can also use the excess flow by branching off your return to feed a reactor or another accessory in your sump.

Plumb a valve and you're be good. I'd use 1" pvc or flexible for your return side as well.

I had a 1500 running against a mag 12 with about 3' of head loss and it provided flow to a reactor and UV sterilizer with their individual valves.

Good Luck and Welcome to the Hobby.

MarkGP · 12/27/2011, 07:04 PM

It will work. Put a ball valve on the output of the pump. With that much flow running through your overflow and through your sump, it will be loud. I have that same glass holes kit and run about 700 gph through it and it's pretty quiet.

syrinx · 12/27/2011, 09:52 PM

Yes I use a mag 18 through a 1500 overflow. Def use a ball valve on output. I also use a SCWD wavemaker- so that takes it down further. Really like it by the way- with the mag 18 pushing it, I only have to clean it once a year and its quiet.

12/26/2011, 05:02 PM	#1
Woodchuck12 Registered Member Join Date: Oct 2011 Location: Nebraska Posts: 245	Mag 18 overflow I just ordered a mag 18 for my sump. Will the Glass Holes 1500gph overflow work with this?

12/26/2011, 08:24 PM	#3
Woodchuck12 Registered Member Join Date: Oct 2011 Location: Nebraska Posts: 245	When I checked it, it looked like the loss would be way less than the 1500 that the overflow would use. Is there a valve that could be used to reduce the overflow to equal the pump? Sorry if these a dumb questions, but I am new to this. EDIT: Never mind, I just found another thread explaining that the overflow just needs to be bigger than the return pump gph wise. But, just to check, the mag 18 after head reduction, should work with the glass holes 1500 gph overflow. Right? Last edited by Woodchuck12; 12/26/2011 at 08:35 PM.

12/26/2011, 08:52 PM	#4
Triton_Z Registered Member Join Date: Jan 2002 Location: North Carolina Posts: 376	It should be a decent match as you are going to lose some flow with your head loss. I would plan on putting a gate or ball valve on the output of the pump to allow you to adjust the flow coming out of your return pump. Don't restrict the overflow plumbing with any valves or too many restrictions (elbows, etc). You can also use the excess flow by branching off your return to feed a reactor or another accessory in your sump. Plumb a valve and you're be good. I'd use 1" pvc or flexible for your return side as well. I had a 1500 running against a mag 12 with about 3' of head loss and it provided flow to a reactor and UV sterilizer with their individual valves. Good Luck and Welcome to the Hobby. __________________ Dan

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
i can trade LED FIXTURE for MAG 18 or 24	marius880	Chicagoland Marine Aquarium Society (CMAS)	5	01/07/2011 09:36 PM
i am looking for a mag 18 or something similar.	marius880	Chicagoland Marine Aquarium Society (CMAS)	1	01/07/2011 07:18 PM
DIY Overflow for 150g w/ 55g sump running on mag-18	bsagecko	Do It Yourself	8	12/23/2007 03:10 PM

12/26/2011, 05:09 PM	#2
redfishblewfish Registered Member Join Date: Nov 2008 Location: Central New Jersey Posts: 716	Check out your head loss HERE.

12/27/2011, 07:04 PM	#5
MarkGP Why do I do this? Join Date: Dec 2005 Location: Bristol, RI Posts: 1,015	It will work. Put a ball valve on the output of the pump. With that much flow running through your overflow and through your sump, it will be loud. I have that same glass holes kit and run about 700 gph through it and it's pretty quiet.

12/27/2011, 09:52 PM	#6
syrinx Registered Member Join Date: Jul 2006 Location: champaign Posts: 3,160	Yes I use a mag 18 through a 1500 overflow. Def use a ball valve on output. I also use a SCWD wavemaker- so that takes it down further. Really like it by the way- with the mag 18 pushing it, I only have to clean it once a year and its quiet.