Flex not too Flexible - Aquarium Advice

scottness2 · 05-31-2008, 10:07 AM

Plumbing my new tank and finding that 1 1/2" flexible PVC is not so flexible. The manufacturer recommends 1 1/4" ID for best performance (Danner MagDrive 1200) yet the outlet is only 3/4" MPT.

Has anyone here had experience going down to either 1" or 3/4". Any PROS or CONS to help me decide what to do would be appreciated.

herefishy · 05-31-2008, 11:02 AM

Dropping down in pipe size increases back pressure and is hard on the pump, creating more resistance on the motor. I would hesitate dropping down to 3/4", though 1" may be OK.

scottness2 · 05-31-2008, 02:07 PM

Thanks for the reply. And you are correct: 1" okay, 3/4" too small. I found a site that calcuated reistance and based on my short runs - I am going with the 1". It is so much easier to work with.

I hope to be making saltwater this evening.

neilanh · 05-31-2008, 08:03 PM

Welcome to AA!

New tank?

05-31-2008, 10:07 AM	#1
scottness2 Aquarium Advice Newbie Join Date: May 2008 Location: Tampa, Florida Posts: 2	Flex not too Flexible Plumbing my new tank and finding that 1 1/2" flexible PVC is not so flexible. The manufacturer recommends 1 1/4" ID for best performance (Danner MagDrive 1200) yet the outlet is only 3/4" MPT. Has anyone here had experience going down to either 1" or 3/4". Any PROS or CONS to help me decide what to do would be appreciated.

05-31-2008, 08:03 PM	#4
neilanh MTS Advocate Community Mentor Join Date: Dec 2006 Location: Northern Virginia Posts: 3,280 Images: 15	Welcome to AA! New tank? __________________ ~Neilan In the DC Metro Area? Check out GWAPA and WAMAS Look, I have a My Info Page! Where's yours? Useful Links: Vote for AA, Nitrogen Cycle, Fishless Cycling, Articles, Acronym List

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05-31-2008, 11:02 AM	#2
herefishy Aquarium Advice Apprentice Join Date: May 2008 Posts: 22	Dropping down in pipe size increases back pressure and is hard on the pump, creating more resistance on the motor. I would hesitate dropping down to 3/4", though 1" may be OK.

05-31-2008, 02:07 PM	#3
scottness2 Aquarium Advice Newbie Join Date: May 2008 Location: Tampa, Florida Posts: 2	Thanks for the reply. And you are correct: 1" okay, 3/4" too small. I found a site that calcuated reistance and based on my short runs - I am going with the 1". It is so much easier to work with. I hope to be making saltwater this evening.