slim overflow

Discussion in 'General Discussions and Advice' started by Dylant, 24 Jun 2014.

  1. Dylant

    Dylant

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    hi guys

    has anyone had a slim overflow get blocked?? my tank has a slim overflow but no emergency overflow is this a problem?

    thanks
     
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  3. RiaanP

    RiaanP Moderator

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    yeah
    A blue green chromis blocked mine. It blocked the ballvalve. And it survived!
     
  4. Dylant

    Dylant Thread Starter

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    wow impressive did your tank overflow?
     
  5. RiaanP

    RiaanP Moderator

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    Auto top up alarm went off. I reset it, and went to the bathroom. Coming back, the alarm was activated again. OK, then I knew something was wrong. First impulse is to check below, is the ATU sensors OK, is my RO drum with water. Could not find the fault.

    Standing up, I then saw that the tank water level was AT the top edge of the tank. Like a glass that is over filled. The meniscus above the edge. Smallest wave and water would push over. Immediately opened the ballvalve and the display flushed down. I was really stunned and could not work out what just happened. About 5 minutes later the little blue green chromis came swimming out from behind the skimmer pump. Only then could I solve the puzzle. Most amazing part. The chromis survived.
     
    Last edited: 25 Jun 2014
  6. Hammerhead

    Hammerhead

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    An overflow comb should help to some degree.
     
  7. carlosdeandrade

    carlosdeandrade

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  8. RiaanP

    RiaanP Moderator

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    Overflow comb will help.

    But you need to factor that in when you build your overflow. It will increase the head height of the water in the display. 2 possible problems. First, if overflow edge is too close to the top of the tank, you can possibly end up with water against your bracing. And when the power goes out, you got more water draining to the sump.

    So you need to factor that in when designing your overflow. Bigger sump overflow capacity and a slightly lower overflow.
     
  9. Dylant

    Dylant Thread Starter

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    Thanks guys I bought a tank with slim overflow and no emergency overflow but seems most slim overflows are like mine.
     
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