Overflow Boxes

Discussion in 'Lighting, Filtration & Other Equipment' started by drew00c, May 10, 2010.

  1. drew00c

    drew00c

    Joined:
    Nov 19, 2007
    Messages:
    96
    Likes Received:
    1
    Location:
    Toronto Ontario
    This might be a really silly question but if an overflow box works with gravity what is to stop the water flow into the sump if there is a poweroutage?
     
    drew00c, May 10, 2010
    #1
    1. Advertisements

  2. drew00c

    Chris_150G

    Joined:
    Nov 4, 2009
    Messages:
    478
    Likes Received:
    52
    Location:
    Crestline, CA
    Because the power is out the return pump will no longer work. So the water level in your tank will drop as the overflow continues to drain water out without any coming back via the return pump. Once the water level in the tank drops below the overflow box the water will stop draining out. So your sump water level should be low enough to allow for the extra water that will flow down in a power outtage. I call it the flood test. The tank water line will drop an inch or so and your sump water will rise many inches. The amount will depend on the ratio between the size of the tank to the size of the sump.
     
    Chris_150G, May 10, 2010
    #2
    1. Advertisements

  3. drew00c

    Smitty

    Joined:
    Jan 3, 2009
    Messages:
    9,609
    Likes Received:
    1,587
    Location:
    Chicago/Oaklawn IL
    Once the siphon breaks because of the water level getting too low in the tank.
     
    Smitty, May 10, 2010
    #3
  4. drew00c

    SeaBee Ha Ha Thats Funny!

    Joined:
    Sep 7, 2009
    Messages:
    2,107
    Likes Received:
    189
    Mine just stops once the water drops below the skimmer opening, no loss of siphon. If you want to test it, and you should, just unplug your return pump.
     
    SeaBee, May 10, 2010
    #4
  5. drew00c

    dcantucson

    Joined:
    Apr 20, 2009
    Messages:
    20,917
    Likes Received:
    1,898
    You should test it anyways.
     
    dcantucson, May 10, 2010
    #5
  6. drew00c

    drew00c

    Joined:
    Nov 19, 2007
    Messages:
    96
    Likes Received:
    1
    Location:
    Toronto Ontario
    Ok this makes sense lol, im still thinking of if a sump is crucial for a tank, ill figure this all out when the time comes to make my purchase
     
    drew00c, May 10, 2010
    #6
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.