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Old 10-08-2013, 02:49 PM   #1
Qwe
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DSB filter


A pleco/guppy breeder gave a talk at my local club recently, and one of the filtration methods he employs is basically a deep sand bed inside a pitcher.

So he takes a pitcher (in his case an empty Brita pitcher)
puts a hollow tube in it with an airline
fills the rest with substrate
puts this in his sumps (I think, or maybe in his tanks)
and turns on the air, which creates water movement down through the deep layer of substrate (he makes sure it's at least 6 inches to create the anaerobic effect) and up through the tube.

Anyone see any problems with this method of filtration? There is no need for creatures to sift the top layers of the bed as the water is flowing through it due to the airline. But would it cause problems with the anaerobic bacteria at the bottom because there is so much water moving through it (instead of the gentle, slow movement a DSB usually has)?
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Old 10-08-2013, 03:57 PM   #2
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I would think it would work more like a normal biofilter.
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Old 10-08-2013, 04:00 PM   #3
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Me too... you think there would be any efficient way to test it? Maybe just set one up in a 10 gallon and dose ammonia, then see if I get nitrates or not? Only problem with that would be how long it would take... how long do DSBs generally take to establish?
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Old 10-22-2013, 06:44 AM   #4
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he has a air stone deep in the sand ? if so its a moving sand bed filter , ive herd both are as good as you can get with surface area for good bacteria
I personally run remote deep sand bed filters on my fw tanks
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Old 10-28-2013, 09:38 AM   #5
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Quote:
Originally Posted by scotty b View Post
he has a air stone deep in the sand ? if so its a moving sand bed filter , ive herd both are as good as you can get with surface area for good bacteria
I personally run remote deep sand bed filters on my fw tanks
The aeration would make it aerobic, so it wouldn't have much capacity to de-nitrify the water...

If I remember correctly, DSB works by providing a medium too thick to be fully circulated. The anaerobic zones actually harbor the bacteria that break down nitrogenous waste.
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Old 10-28-2013, 01:39 PM   #6
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flouidized*** sand bed?? ive seen these employed in sumps before and as long as the sand is constantly moving then you are good.
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Old 10-28-2013, 10:03 PM   #7
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Those are set up super low flow, I read up on them for a while. Essentially the sand is perpetually falling when running correctly. I've seen a couple builds documented across the web..
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Old 10-29-2013, 12:56 AM   #8
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He doesn't have the air stone in the sand, he has a tube in the sand and the air stone is inside that. No air is being pumped into the sand.
His theory is that, as water is pulled down into the sand and up the tube, it is losing its oxygen in the upper layers of sand and then goes through the anaerobic layers at the bottom.

But it's really all just conjecture until someone does some experiments... I think tattooed should get on that!
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Old 10-29-2013, 03:00 AM   #9
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That's a bit different than what I was thinking.. if you had pool filter sand or something that wouldn't clog as easily... It might work... Is it an open intake that slowly returns sand to the top via the lift tube or is it strained?
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Old 10-29-2013, 03:32 AM   #10
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This is more like a ugf that uses sand.
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Old 10-29-2013, 11:26 AM   #11
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Sand does not enter the tube, there is no movement of the sand itself.

And it has the same flow concept of an UGF, yes, but UGFs aren't usually at least 6 inches...
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Old 10-29-2013, 07:30 PM   #12
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as long as you have flow thrue the tank a air stone to curculat water is not needed , there is no need to pull the water thru the sand ,. if you can add it to a sump i would recomend putting live black worms in the samd also
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Old 10-30-2013, 07:44 AM   #13
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Quote:
Originally Posted by scotty b View Post
as long as you have flow thrue the tank a air stone to curculat water is not needed , there is no need to pull the water thru the sand ,. if you can add it to a sump i would recomend putting live black worms in the samd also
That's for a DSB, this isn't exactly a DSB, and it's like a combo UGF, sponge, FSB(ish) thing that relies on water being both mechanically and biologically filtered by the sand particles. Apparently it was called a DSB filter because of the anaerobic properties of water on the lower levels, which, while similar, does not mimic the anoxic region that would be in a DSB.
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Old 10-30-2013, 03:54 PM   #14
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Right, DSB filter was just the closest thing I could think of for a name that describes what it's supposed to do...
I guess I just gotta commit and do an experiment with an empty tank to see if it works.
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