Flow through sump

Discussion in 'Beginner Discussions' started by VicZA, 22 Aug 2013.

  1. VicZA

    VicZA

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    I have been wondering ...

    If you have a big overflow and a strong pump, then theoretically you can have a strong flow through your sump (yes/no) ?

    If so, is that a good thing or not ? I am inclined to think that if you have a slow flow, then the skimmer has a better chance of skimming more effectively, but I may be wrong.

    Please share experiences ....
     
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  3. HOT SAUCE

    HOT SAUCE

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    i think it mostly depends on what you have in the sump eg. live rock, dsb, cheato etc. i read a post somewhere where @RiaanP said that for every 15cm of sump width you need at least 1000lph flow but that applies to dsb. the other thing is that you should turn over your total watervolume about 10 times in an hour but the sump it self is a lot smaller than the DT or your total water volume so it obviously gets alot more turn over compared to its own volume.
     
    Last edited by a moderator: 26 Nov 2015
  4. RiaanP

    RiaanP Moderator

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    yeah, but 1000L/h delivered into your display, after head height and back pressure is taken into account.
     
  5. VicZA

    VicZA Thread Starter

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    Ok, so I am not going with DSB or LR but rather bio cubes. My DT is 320 litres and sump a further 90, so if I was to get a 6000l/h DC pump and run it @ 80% then I will get a turn over of 15 times on the DT and 12 times on total water volume .... sound good ?
     
  6. 459b

    459b Moderator MASA Contributor

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    Depends what you want, I prefer a longer turnover so tht the water has more contact time with skimmer and other reactors.
     
  7. HOT SAUCE

    HOT SAUCE

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    whats the width of your sump?
     
  8. HOT SAUCE

    HOT SAUCE

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    @ 80% your water will turn 11 times and thats before we consider head hight and bends etc. so you are looking more like 10 times in an hour
     
  9. HOT SAUCE

    HOT SAUCE

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    if your sump is about 30-40cm wide 4800lph will be plenty for your DSB
     
  10. VicZA

    VicZA Thread Starter

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    This was my original point exactly
     
  11. dallasg

    dallasg Moderator MASA Contributor

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    if you have no dsb, it doesnt really matter... its something i have actually never worried about
     
  12. mariusmeyer

    mariusmeyer

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    I run a DSB and my sump width is 45cm. Total movement through sump is only about 1500-2000LPH. Total system volume is 700L so that's only about 2-3 times turnover rate.
     
  13. Trasique

    Trasique tahir

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    If the flow through the sump is very little, the only issue you might encounter is temperature difference between sump and display, sometimes by as much as 2 degrees.

    I personally only turnover 2 to 3 times my display volume, with no issues.

    One plus about running slow flow, apart from better skimmer contact time is the actual electricity saving of running a small return/uplift.
     
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