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Thread: Tornato in my Pond

  1. #1
    Join Date
    Feb 2005
    Woodbury Minnesota

    Tornato in my Pond

    After the koi pond rebuild, I noticed that the air stream from a single aerated BD seem to bounch around from side to side. With some periodic "burbing", just assumed that it was an irregurlar air output.

    One day, I had the pump off that served the BD/TPR circuit. The air stream was now a uniform, straight column, even with a burp here and there.

    I turned the pump back and and really watched the air column for a awhile. I was memorized as I watched the air column rotate like the tornado in the Wizard of OZ, around the center point of the BD, at about a 10 degree lean.
    Every several minutes or so, it made a complete rotation.

    Surface rotation around the perimeter of the pond was aways noticable. But apparently the TPRs were doing want I wanted, good circulation through much of the water depth, not just in the lower depths.

    At least I thought it was cool.
    Last edited by mpageler; 04-27-2012 at 10:13 AM.
    MN Mike

    5400g 10'x14'x 5
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  2. #2
    jimfish98's Avatar
    jimfish98 is online now
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    Jan 2012
    Central Florida
    Post a pic or video, would like to see that.

  3. #3
    MikeS's Avatar
    MikeS is offline
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    May 2009
    Jonesborough Tennessee, United States
    Mine acts the same way but then I have a nearly circular pond with angled TPRs. It rotates clockwise, dunno if that the right direction for the Northern Hemisphere or not
    Mike & Sharon Shaw
    Jonesborough TN

  4. #4
    yorkie's Avatar
    yorkie is offline
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    Dec 2007
    Grand Rapids, MI
    My four air domes produce the tornado effect but I only have one that burps.

    A true pondaholic!
    40,000 Gallons, 45 koi

  5. #5
    koiman1950's Avatar
    koiman1950 is online now
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    Senior Member ~ Koi Health Care Committee Member
    Join Date
    Feb 2008
    San Jose, Ca
    Yes, Mike, with proper circulation, that is what your air domes should look like.

    MikeS, they should actually rotate counter clockwise in the northern hemisphere. Go flush your toilet and see which way the water

    Of course, this situation is totally controlled by the directional flow of your tprs.


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