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Thread: my pond build - w/ airlift assist

  1. #1
    Fry
    Join Date
    Feb 2011
    Posts
    4

    my pond build - w/ airlift assist

    30 more days until spring.... hopefully some 50 degree days before then so I can complete this project.
    This is the old pond which was only 2 years old - out grew it (12x12x3)
    my pond build - w/ airlift assist-p1010005-10.jpg

    I saved all the old filtration stuff
    my pond build - w/ airlift assist-p1010003.jpg

    Took down a maple tree that was a thorn in my side
    my pond build - w/ airlift assist-p1010021.jpg

    homemade pvc frame/netting w/ access door
    my pond build - w/ airlift assist-p1010005.jpg

    so much better - so open now
    my pond build - w/ airlift assist-013.jpg_s.jpg

    construction of new pond

    my pond build - w/ airlift assist-p1000344.jpg_s.jpg

    back filling old pond
    my pond build - w/ airlift assist-p1000350.jpg_s.jpg

    digging out the new one
    my pond build - w/ airlift assist-p1000356.jpg_s.jpg

    21x16x4
    my pond build - w/ airlift assist-p1000366.jpg_s.jpg

    filtration pit
    my pond build - w/ airlift assist-p1000380.jpg_s.jpg

    trenched for bottom drains
    my pond build - w/ airlift assist-p1000379.jpg_s.jpg

    several weeks later... 2 bottom drains and 2 tpr's in this wall
    my pond build - w/ airlift assist-p1000548.jpg_s.jpg

    2 skimmers and another tpr in the center.
    my pond build - w/ airlift assist-p1000551.jpg_s.jpg

    It can't melt fast enough!!
    my pond build - w/ airlift assist-p1000782.jpg_s.jpg

  2. #2
    Fry
    Join Date
    Feb 2011
    Posts
    4
    I picked up a medo LA80BN airpump to run the airlift. I plan on having the 2 bottom drains gravity into a 275 tote > 55g w/ poly strapping and build an airlift manifold like how "CarolinaGirl" did. Hopefully I can get it to flow back into the pond via 2) 1 1/2" TPRs and 1) 2" TPR, If I happen to have too much flow perhaps outflow via 3" pipe at water surface.
    The 2 skimmers will gravity into a 55gal drum > ES4500 pump > 3 S&G filters > waterfall.

    Any opinions on 2" vs 1 1/2 airlift tubes? I figure injection point at 5' since that's what the medo is rated at. I understand I'll have draw down in the tote and poly drum so I guess I need to calculate that with lift height? Anyone know how many tubes I can run off 1 medo 80?

  3. #3
    Oyagoi CarolinaGirl's Avatar
    Join Date
    Sep 2006
    Location
    South Carolina
    Posts
    1,620
    The only potential problem you may have is returning the water via those small pipes. I don't remember the exact numbers but I think a 2" pipe only gravity flows around 900 gph. I used two 4" return pipes on mine and even those two pipes can't keep up with the flow. My air pump is bigger than the one you are using, but I have a good bit of the air going to the fluidized bed because the flow rate was just too much when it all went to the air lifts. you may be just fine with that 80. so much about this is trial and error. You may just have to try it and see what works. The beauty of having the manifold exposed is that you can easily make changes if your first efforts don't work as expected.

  4. #4
    Fry
    Join Date
    Feb 2011
    Posts
    4
    Quote Originally Posted by CarolinaGirl View Post
    The only potential problem you may have is returning the water via those small pipes. I don't remember the exact numbers but I think a 2" pipe only gravity flows around 900 gph. I used two 4" return pipes on mine and even those two pipes can't keep up with the flow. My air pump is bigger than the one you are using, but I have a good bit of the air going to the fluidized bed because the flow rate was just too much when it all went to the air lifts. you may be just fine with that 80. so much about this is trial and error. You may just have to try it and see what works. The beauty of having the manifold exposed is that you can easily make changes if your first efforts don't work as expected.
    I read that also somewhere that a 2" will only gravity flow 900gph per inch above water surface. I'm not sure what 1 1/2 will flow. I was thinking of adding 1 but now sounds like 2) 3" pipes as overflow protection , let those return at pond level. Your airlift manifold is a nice and simply design, sure beats my thoughts of adding 4 legs (flanges and down pipes to extend the depth of a drum) and then I would have to use stainless bolts to center the pipes inside the legs for airlift. If it wasn't 33 degrees outside I'd be playing around with the airlift.

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