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Old 01/09/2019, 08:40 AM   #1
lpsouth1978
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Any reason do have 2 returns.

I am working on another 40b build and am getting ready to drill it. On my previous build I drilled 2 returns, but was thinking that 1 would be just fine. Other than having more flow options, is there any advantage to having 2 returns instead of just 1?


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Old 01/09/2019, 10:21 AM   #2
Vinny Kreyling
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Slower flow from both returns might make a sand bed stay in place.


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Old 01/09/2019, 10:26 AM   #3
nereefpat
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If I was doing the overflow in the middle, I would do a return on each side of it....overflow in the corner, one return on the opposite side.


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Old 01/09/2019, 10:35 AM   #4
crawlerman
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I don't see any reason for it. If you want flow from more than one output just add a manifold.


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Old 01/09/2019, 12:02 PM   #5
ChronicReefH2o
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Honestly, there is no reason for multiple return outlets. Circulation pump are for this purpose to give flow and movements to the tank. The return allows for "Filter" water to be return and your circulation pump to mix things up. and the cycle starts over again


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Old 01/09/2019, 12:04 PM   #6
lpsouth1978
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Thank you all for the responses. I think I am going to just do 1 return. This will simplify the plumbing. I am not worried about the return blowing sand all over since most of the flow in the tank is provided by the wave makers NOT the return.


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Old 01/10/2019, 07:50 PM   #7
FullBoreReefer
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For that size tank I’d do one to cut costs.

The tank I just had built I went with two. The tank is 60x36x24 with an internal Modular Marine 36” overflow box centered on the back panel.. I wanted the tank to look symmetrical so I went with one on each side...strictly for looks.


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Old 01/10/2019, 09:50 PM   #8
jjencek
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I heard somewhere that people use two as a redundancy - just in case one gets blocked for whatever reason.


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Old 01/11/2019, 05:39 AM   #9
Green Chromis
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Quote:
Originally Posted by FullBoreReefer View Post
For that size tank Id do one to cut costs.

The tank I just had built I went with two. The tank is 60x36x24 with an internal Modular Marine 36 overflow box centered on the back panel.. I wanted the tank to look symmetrical so I went with one on each side...strictly for looks.
What is the cost difference between one or two returns in a tank that size? I would do two, as it would give better water movement in the tank.


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Old 01/11/2019, 11:55 AM   #10
FullBoreReefer
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What is the cost difference between one or two returns in a tank that size? I would do two, as it would give better water movement in the tank.
Maybe $30-$60 in fittings/bulkheads/loc-line/pipe/etc. Never said it would be a huge savings, but to some people money is money...


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Old 01/11/2019, 03:02 PM   #11
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With a 40B only one is needed, most the flow should be from the wavemakers.


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Old 01/14/2019, 11:46 AM   #12
lpsouth1978
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I ended up going with just 1 return and I am happy with that decision so far.


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