1. Warr7207

    Warr7207

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    I have started my new tank and have had change things around quite a bit.

    I need to know, what kind of flow is recommended into/over the DSB.

    I have quite a stronger flow than before.
     
    Last edited: 3 Apr 2008
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  3. lIghty

    lIghty

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    it needs to be strong enough that cyno doesn't start growing but not so strong as to wash the sand and all life form away, you might have to play around with settings. IMO
     
  4. Kanga

    Kanga Retired Moderator MASA Contributor

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    Warr even if you have much higher flow its dispersed over a very wide area, anything that does not continuously disturb the sandbed, bit not to fast to give the DSB contact time with the water
     
  5. jacquesb

    jacquesb Retired Moderator

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    Hi Warr - I think that the suggested "going rate" is +-2500 to +-4000 litres per hour. This should roughly translate to +-3 to 4 times your tank volume per hour.

    The idea of the sump is that it CLEANS your tank - filters it.... So - too quick, and the filtration system cannot clean the water.... TOO slow, then not enough tank water is replaced per hour to have it cleaned by your filtration system....

    I also believe that the skimmer's pump should not be much smaller than the sump flow-through rate.... as well as the water flow rate over your in-sump DSB.....
     
  6. Puppy

    Puppy Lives for SPS

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    I like to have a slow waterflow over my sandbed so that the DSB has contact time with the water.
     
  7. jacquesb

    jacquesb Retired Moderator

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    Hi Puppy - how slow is "slow" for you? do you know perhaps (+-) in litres per hour?
     
  8. Puppy

    Puppy Lives for SPS

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    mmm i aint sure never worked it out but i would say between 2000 -3000L an hour.
     
  9. jacquesb

    jacquesb Retired Moderator

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    Thanks, Puppy - that confirms what I said nicely ;-)
     
  10. Warr7207

    Warr7207 Thread Starter

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    I have 5000L per hour. The inlet is direct onto a flat piece of liverock above the DSB.

    It is not disturbing the sandbed, I was worried about O2 being forced into the DSB
     
  11. jacquesb

    jacquesb Retired Moderator

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    Hi Warr - 5000 litre is a little bit high - BUT, I am quite sure that it won't force enough O2 into the sand-bed to cause problems....
    Do you have a valve on the outlet from the overflow? Or not?
     
  12. Warr7207

    Warr7207 Thread Starter

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    The flow is determined by my external skimmer. And I like to skim really hard ;), while the tank is new, to try eliminate any mini-cycles.

    Will calm done the skimmer in the next couple of weeks
     
  13. Awvince

    Awvince Here fishie fishie

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    Uhmmm, I could be wrong but the slower the water flows through your skimmer the better, more contact time. As I said i could be wrong.
     
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