Pump restriction through output holes..

BBoley24 · 09/29/2006, 02:11 PM

i have been told to run double the size fitting through my Mag 9.5 to my tank. For instance... its got a 3/4" fitting on the pump so I should make it into 1 1/2" piping to my tank. My only problem here is that the holes going to my tank may be big enough but the adapters that came with my tank's plumbing take it right back down to 3/4" at the bottom of the drilled tank. Should I take it back down to 3/4" then back to 1 1/2" once through the bottom of the overflow? Or because of the restriction in the overflow should I even bother running 1 1/2" piping and just run the 3/4" all the way through?

sjm817 · 09/29/2006, 02:49 PM

This is one of the challenges with mag pumps. They are flow pumps and dont do well with small plumbing. The RR tanks have 3/4" bulkheads. Yes, run the large plumbing on both side of the bulkhead if you want to maximize the flow. 1.5" is a real PITA to work with. I'd use 1.25" to make it more manageable.

silverwolf72 · 09/29/2006, 03:17 PM

Depents on the distance. if it's really short, stay with 3/4. 3/4 to 1 1/2 seems like alot ,but reduce as far down the line as you can(right before the tank bulkhead).

sjm817 · 09/29/2006, 05:05 PM

3/4" will cut the flow back drastically on the typical sump to display distance. Typically, the full flow of a mag9 is too much for a return pump anyway. Less flow is not a bad idea.

bklynmet · 09/29/2006, 05:12 PM

I don't think it'll matter much once you get the piping into the tank... by this I mean use the larger piper up until the bulkhead and then use 3/4 in the tank...

how much plumbing would you have in your tank?

I just finished redoing my CL with mag 9.5 from one with a SCWD with all 3/4" plumbing to one that has 1.25" on the return up until a T that reduces to two 3/4".. awesome flow now compared to before and am kicking myself for waiting so long to do it...

09/29/2006, 02:11 PM	#1
BBoley24 Moved On Join Date: Aug 2005 Location: Greensburg PA Posts: 917	Pump restriction through output holes.. i have been told to run double the size fitting through my Mag 9.5 to my tank. For instance... its got a 3/4" fitting on the pump so I should make it into 1 1/2" piping to my tank. My only problem here is that the holes going to my tank may be big enough but the adapters that came with my tank's plumbing take it right back down to 3/4" at the bottom of the drilled tank. Should I take it back down to 3/4" then back to 1 1/2" once through the bottom of the overflow? Or because of the restriction in the overflow should I even bother running 1 1/2" piping and just run the 3/4" all the way through?

09/29/2006, 02:49 PM	#2
sjm817 On Yer left! Join Date: Sep 2004 Location: Northern VA Posts: 18,777	This is one of the challenges with mag pumps. They are flow pumps and dont do well with small plumbing. The RR tanks have 3/4" bulkheads. Yes, run the large plumbing on both side of the bulkhead if you want to maximize the flow. 1.5" is a real PITA to work with. I'd use 1.25" to make it more manageable. __________________ - Scott

09/29/2006, 05:05 PM	#4
sjm817 On Yer left! Join Date: Sep 2004 Location: Northern VA Posts: 18,777	3/4" will cut the flow back drastically on the typical sump to display distance. Typically, the full flow of a mag9 is too much for a return pump anyway. Less flow is not a bad idea. __________________ - Scott

09/29/2006, 05:12 PM	#5
bklynmet Registered Member Join Date: Sep 2004 Location: Elkhart Posts: 527	I don't think it'll matter much once you get the piping into the tank... by this I mean use the larger piper up until the bulkhead and then use 3/4 in the tank... how much plumbing would you have in your tank? I just finished redoing my CL with mag 9.5 from one with a SCWD with all 3/4" plumbing to one that has 1.25" on the return up until a T that reduces to two 3/4".. awesome flow now compared to before and am kicking myself for waiting so long to do it... __________________ PBITAWA!!! Removing skimmate, scraping algae, now changing a new set of baby diapers... will the crap ever end? Current Tank Info: 75g, 16g Lifereef sump w/ Lifereef VS2-24 mag 7 return, 6x54w T5, Separate 20g RR Oceanic w/ 10g Sump, Separate 4g office pico tank

09/29/2006, 03:17 PM	#3
silverwolf72 Registered Member Join Date: Jul 2005 Location: Lake Forrest CA Posts: 1,732	Depents on the distance. if it's really short, stay with 3/4. 3/4 to 1 1/2 seems like alot ,but reduce as far down the line as you can(right before the tank bulkhead).