Microbubbles driving me mad.

Discussion in 'General Discussions and Advice' started by Meneer, 12 Apr 2011.

  1. Meneer

    Meneer

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    For those running OVERFLOW-> DSB -> RETURN chamber.

    How much is the water level in the return chamber lower than the DSB?

    I tried stuffing that white filter media in my return chamber and it helps cut down the bubbles...... untill it get's clogged and I touch that media... then it takes me half an hour to stop my return pump from collecting bubbles that comes from the flow over my dsb.

    What should the difference in level be between dsb and return chamber?
     
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  3. RiaanP

    RiaanP Moderator

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    Water level in return should be 10 to 30mm lower than DSB.

    Second partitions should be 5 to 10mm lower than the first.

    Do you have an ATU?
     
  4. RiaanP

    RiaanP Moderator

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    Also, what is the flow rate in your sump. Sump volume, Display bolume and return pump strength?
     
  5. Meneer

    Meneer Thread Starter

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    Yes I have a ATU
    2800l/h return
    Sump volume 180 litres
    DT 228

    Total around 400 - 18kg rock, 80kg sand
     
  6. Meneer

    Meneer Thread Starter

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    Currently running 55mm below dsb and still bubbles...
     
  7. RiaanP

    RiaanP Moderator

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    Return pump is too big.
    3 to 5 time turn over is the rate advocated for flow across the DSB. But that obviously depends on the width of the DSB. (I experience make me think that rate is on 300mm wide sumps)
    You got with head height loss at least 2000L/h delivered back to display and that is also your flow rate across the DSB.

    228 Display * 3 to 5, gives 684 to 1140 L/h rate needed. With head height loss, I reckon a 1200L/h return pump should do fine. Maybe up to 1500L/h

    Also increase the return chamber level to about 10 to 30mm below DSB. But be sure your sump can still handle Eiskom Power of Darkness.
     
    Last edited: 12 Apr 2011
  8. Meneer

    Meneer Thread Starter

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    I lifted it to 10... that seems to work - still gotta do the Eskom test.

    I doubt If I am getting the full 2800, cause it has to lift over a meter through 4 elbows.
     
  9. RiaanP

    RiaanP Moderator

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    oops, now too late to say it, but hope you used saltwater to do the increase....
     
  10. Meneer

    Meneer Thread Starter

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    I was on 1026, so I added RO - was only about 10 litres
     
  11. Meneer

    Meneer Thread Starter

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    Most of the bubbles now comes from my overflow to sump :-(
     
  12. RiaanP

    RiaanP Moderator

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    [​IMG]
    What I did with my downpipe. Bubbles and salt spray is trapped in the upright part.
     
  13. Meneer

    Meneer Thread Starter

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    Cool

    I tried it with a normal elbow to a T. 1 going up and 1 going down.

    Biggest problem is my overflow bubbling up from the bottom of the pipe.
     
  14. RiaanP

    RiaanP Moderator

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    nope, use a 45degree T piece. Another 45 degree elbow to get it straight up again.
    On the bottom I got about 200mm extra piece of PVC. Works.
     
  15. Meneer

    Meneer Thread Starter

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    Thanks - will try..
     
  16. Meneer

    Meneer Thread Starter

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    @RiaanP I think you are right - my turnover is to big - that's hy I get this huge bubble tsunami in my overflow chamber.

    There is a ball valve on my return. Can I use that as restriction or will it stuff up my pump?
     
  17. RiaanP

    RiaanP Moderator

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    Nope, that will flood your display.
    Options is to T the return line, T out go to first chamber with ball valve controlling the flow to first chamber. Or you can do what I did, use the T-off to drive various other reactors like phosphate removers etc.

    [​IMG]
    Older pic, but you can see my T-offs on return line. Driving the Cryptic tank and phosphate reactor.
     
  18. Meneer

    Meneer Thread Starter

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    @ RiaanP Sorry man - What I meant, is there is a ball valve on the between my return pump and my display. I can not see how that will flood the dt?
     
    Last edited: 13 Apr 2011
  19. RiaanP

    RiaanP Moderator

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    That will create a lot of extra back pressure on the pump. In long run not nice.

    Going smaller return pump route would safe some money at the end of the year. Less wattage consumed. Or drive multiple units from it.

    Like in my setup, where I drive multiple items from same return pump it reduces my plug points count. and simpify my setup (as if that possible). I'm running a Carbon Reactor and Phosphate reactor on one T-off line in series. Plus on other T-off, I got a 40L Cryptic tank and 90L refugium.

    If you want to keep that pump in place now, you can either fix the bubble issue in the skimmer chamber. or just T the return line to direct water back to first chamber controlled with ball valve. Basically what you want to do, but without creating back pressure.

    For ideas to play with, check all the fun things I did.
    http://www.marineaquariumsa.com/showthread.php?t=20381
     
    Last edited: 13 Apr 2011
  20. Meneer

    Meneer Thread Starter

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    Ok thanx - My main concern is that my flow is way to high... Will make a plan.

    What is a Cryptic tank?
     
  21. RiaanP

    RiaanP Moderator

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    Cryptic, a zone with really slow flow, dark and resemble the deep inner reef. Worms, sponges and non-photosynthetic live forms who prefer slow flow flourish here.
     
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