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Old 03-12-2003, 04:49 PM   #1
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Closed loop

Can any one give me some pointers is doing a closed loop.
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Old 03-12-2003, 04:59 PM   #2
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What are you looking to do with the closed loop and what size pump are you going to use?
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Old 03-12-2003, 05:21 PM   #3
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reefrunner... I want to set on 2 closed loops one that runs down the inside of the tank with 3 water outlets and one that runs under the sand with elbow outlets the pumps are ocean runners 3000's.
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Old 03-12-2003, 08:07 PM   #4
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and one that runs under the sand with elbow outlets
What would be the purpose of this? You would loose all the denitirfication properties of the sand. By running a closed loop under the sand, it would constantly oxygenate the sand bed and would not allow the anoxic regions required for denitrification.
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Old 03-12-2003, 09:26 PM   #5
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I wonder if Puffer is talking about simply hiding the plumbing under the sand and providing a lateral flow across the surface with the elbows, not actually aerating the sand bed like a reverse flow UGF - that would be a disaster.
I don't think water circulation has to be that fancy though. A couple powerheads or a sumpless overflow (short circuited with a return pump) would work better.
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Old 03-12-2003, 09:35 PM   #6
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a sumpless overflow (short circuited with a return pump) would work better.
That's pretty much a simple description of a closed loop, accept you would not use an overflow, you would use a direct siphon to the pump.
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Old 03-12-2003, 10:45 PM   #7
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The only advantage I can see to this might be less heat being introduced to the tank because the pump is external. As you know, most external pumps have air cooled motors. I am going to use a closed loop on the 180 when I set it up. Not because of heat problems, but because I have a Little Giant pump that is large enough and I didn't see any other use for it. I have been told that this is one disadvantage to the Mag Drives...they leach more heat into the water than Little Giants, Iwakis, ect... Even if they are run externally. It would also be an advantage on a nano tank since PH's take up lots of room in a small tank. Check out www.vatoelvis.com for plans for the buried plumbing.
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Old 03-12-2003, 10:58 PM   #8
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Is this the link you were referring too?
http://www.cichlid-forum.com/articles/ug_jets.php
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Old 03-12-2003, 11:17 PM   #9
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The only advantage I can see to this might be less heat being introduced to the tank because the pump is external.
There are a couple more advantages to a closed loop, one being the flexibility of water movement . With The Flex PVC and all the other fittings available, you can litterally have a dozen different ways to move water in the tank via one external pump. Where with powerheads...there are but a few. The other advantage is asthetics. A few returns coming over the side of the tank vs 3 to 4 phs....
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Old 03-13-2003, 07:47 AM   #10
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Mark,
Yeah, I guess it is...I hadn't been to that site in so long I didn't realize they had moved .
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