Linking Two Planted Tanks (Away With Inline Hardware) Sump Method - Page 2 - The Planted Tank Forum
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post #16 of 18 (permalink) Old 01-11-2017, 06:27 PM
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Originally Posted by Teebo View Post
What are your recommendations on drain size? If my returns are 1/2" should the drain be 3/4" so I have room for gating?
Before plumbing take a peek at Herbie Overflow Plumbing Guide for Quiet Reef Aquariums - gmacreef

The beananimal overflow is a herbie with two emergency lines, one at a higher level so that it will remain dry until a true emergency occurs.


You often want to use the same diameter pipe for both the siphon and emergency drains. This allows you to use a single drill size.

The worst case scenario (complete siphon blockage) requires that the emergency drain can handle 100% of the pumps capacity. There are charts of maximum flow per pipe diameter (etc: How to size full siphon drains? - Reef Central Online Community ).

I would recommend 3/4" pipe with a <500gph rated pump. If you are using a larger pump try 1" pipe with a herbie setup (the beananimal has two emergency lines so 3/4" is probably okay).

Even if you plan to use an adjustable pump at lower power, its smart to ensure that no overflow will occur if it is somehow stuck on max power.
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post #17 of 18 (permalink) Old 01-11-2017, 07:09 PM Thread Starter
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You have to remember this setup is tiny, this is a freshwater system that needs a very minimal flow not to disturb my fish. I understand everything on the overflow/emergency side all needs or should be of same diameter, but the return:export system ratio is what I am asking about. Dual 3/4" return jets are massive for these tanks, they are basically 10 gallon tanks. I would think I can have a smaller return pipe then exit, I planned to have nothing larger than dual 1/2" return nozzles on each tank. Having two on each tank brings the flow rate down on each to spread out the disturbance and provide redundancy. I barely need the water to exchange between the two tanks for stability, I run my systems borderline walstad but I have the principal down and my tanks are very clean.

I will look into the principals of the bean again this evening. The system I had in mind used two 3/4" lines, one main gated down and the other was placed higher fully open for emergency only.
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post #18 of 18 (permalink) Old 01-11-2017, 08:16 PM
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You are right, I was just thinking of the drain lines. The return lines can be whatever diameter you want. Larger will reduce pump back-pressure (possibly less noise/energy consumption) but two 1/2" would be more than sufficient.
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