Reeftek External water level

Discussion in 'Protein Skimmers, Mechanical Filtration' started by viper357, 1 Jun 2007.

  1. viper357

    viper357 Admin MASA Contributor

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    Has anybody experimented with the external water level on their reeftek skimmers?

    I have just built a platform to stand my skimmer on, raising it out of the water by about 7 or 8 cm's.

    Here is a pic of the water level where it is now, in the last few days I am getting hardly any skimmate, maybe 3mm as opposed to about 20mm I used to get, so I am now thinking that there must be an optimum external water level for this skimmer to operate at it's optimum.

    You can see where the water level used to be by the greenish/yellow tinge on the airline.

    [​IMG]
     
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  3. phat

    phat

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    shouldn't you be able to compensate the external water level by raising the water outlet?
     
  4. viper357

    viper357 Thread Starter Admin MASA Contributor

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    I've tried both lowering and raising, nothing helped.
     
  5. phat

    phat

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    now i havent fiddled that much with a reeftek but my thinkng would then be to partially block the outlet of the skimmer kinda like the aqua medic sl does to adjust bubble height??
     
  6. viper357

    viper357 Thread Starter Admin MASA Contributor

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    But why is the skimmer doing this? Surely the outside water level should not affect the way the skimmer performs. The water level inside the skimmer is still the same. Has it got something to do with water pressure on the venturi or the bubbles inside the skimmer?
     
  7. phat

    phat

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    is this skimmer on your system and all you have done is lowered the water level?
     
  8. DragonReef

    DragonReef

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    Dean it will have an affect. Remeber that pump is feeding and chopping up the water. By raising the skimmer you are putting head pressure on the pump, therefore slowing is down. Ideally your skimmer should sit in your sump at the same height you want the water level to be, putting zero head pressure on the pump.
     
  9. Craig

    Craig

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    I would disagree to some extent. It's a bit of a trade-off. On the one hand, a shallower pump will pump less water through the skimmer body due to head loss, but a deeper submerged pump will probably produce less air volume in the skimmer.

    I have raised my TS1 so that the sump water level is barely above the skimmer inlet, and have found my skimmate production to have improved.
     
  10. viper357

    viper357 Thread Starter Admin MASA Contributor

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    Anthony, your post confused me a bit, but then I realised why... I have also raised the pumps with the skimmer, so the entire skimmer and pumps have all moved up, which means there is even less head on the pumps as the pump inlets are now sitting closer to the water surface. Did I explain that right?
     
  11. viper357

    viper357 Thread Starter Admin MASA Contributor

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    Hi Craig

    Is that similar to my pic above? Did you also raise the pump?
     
  12. Craig

    Craig

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    The height difference between the water surface and the skimmer outlet is what matters for head pressure. When your skimmer was lower down, the outlet would have been closer to the sump water surface, so lower head pressure. Now the outlet is further above the water surface, so more head pressure.
     
  13. Craig

    Craig

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    Yes, just built a small glass shelf to raise the whole skimmer and pump assembly.
     
  14. viper357

    viper357 Thread Starter Admin MASA Contributor

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    ah, now that makes sense, thanks.
     
  15. Alan

    Alan Admin MASA Contributor

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    Hell this is getting confusing. I have never used the Reeftek but from what i can see it has a auto lever for the water in the skimmer itself similar to that of the new Tunze skimmers. So i would drop the skimmer until the outlet just sticks out the water by about 1-2 cm's. The reason for this is as DR has stated that you dropping the head pressure on the pump itself. I know the BM is also recomended to be at a depth of 20-25 cm other wise the pumps are pushing too hard to drive the water flow and not enough airflow.
     
  16. viper357

    viper357 Thread Starter Admin MASA Contributor

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    Well I removed the stand I built and put the skimmer back to how it was, she's pumping much better now :D
     
  17. djmurray

    djmurray Email me about anything

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    Phwww after all those long and confusing conversations it works lol:)
     
  18. viper357

    viper357 Thread Starter Admin MASA Contributor

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    yeah it works as long as you don't fiddle with it in the first place ;)
     
  19. millepora

    millepora

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    Silly boy
     
  20. viper357

    viper357 Thread Starter Admin MASA Contributor

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    leave me alone, I like to fiddle
     
  21. Kanga

    Kanga Retired Moderator MASA Contributor

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    there are certain things that we just dont want to know
     
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