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  1. #41
    Quote Originally Posted by Stuffyrat View Post
    I just swap the sock when it is full, or turn it inside out and blast with hose pipe over maples

    Sent from my VOG-L29 using Tapatalk
    Just looked it's a 1.5 mm drill bit but there is nearly 600 holes, I only know because Mr bcc made the template on cad, not that I've counted lol May try to block some off with gaffa tape and see if it improves the lift

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  3. #42
    Iím about to make mine so will use less holes and see what occurs


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  5. #43
    Quote Originally Posted by bigcarpchaser View Post
    Iím about to make mine so will use less holes and see what occurs


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    Worth a go bud Airlifts - pumping water around a gravity system using only airfew pics of filter sock before and after 3 hours

    Sent from my VOG-L29 using Tapatalk

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  7. #44
    It works well doesnít it?
    I only held mine over the outlet for 5 minutes at it picked up loads of junk.

    Also Iíve turned my pumps down and my air down, hasnít made a blind bit of difference to my water parameters but less suspended junk which is nice.
    Still have plenty of flow round the pond via the airlift though.


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  9. #45
    Quote Originally Posted by bigcarpchaser View Post
    It works well doesnít it?
    I only held mine over the outlet for 5 minutes at it picked up loads of junk.

    Also Iíve turned my pumps down and my air down, hasnít made a blind bit of difference to my water parameters but less suspended junk which is nice.
    Still have plenty of flow round the pond via the airlift though.


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    Win win then bud Airlifts - pumping water around a gravity system using only air might make a second one as its alot more efficient

    Sent from my VOG-L29 using Tapatalk

  10. #46
    If we donít move house then next years project will be to convert to airlift.
    Donít think itíll be a massive job using 2Sugars external tank method.
    If we do move then the next pond will be airlifts from the start.
    Not having the courage of my convictions to begin with was (another) mistake lol.
    Iíd certainly encourage anyone considering building a pond now to at least consider them as the energy saving alone would be considerable.


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  12. #47
    Extreme Koi Member Rank = Hassai NickK-UK's Avatar
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    I came across this interesting piece - submergence and also sizing of air pumps:

    B2.jpg
    Source: https://www.plantservices.com/articles/2002/12/


    Improving airlift performance

    There's also an interesting paper on the use of vortices on improving airlift performance: https://digitalcommons.bucknell.edu/...=honors_theses this uses a back flow through the air injection nozzle at 45 degrees to make the airlift water rotate - including the air.

    So by having an combined water + air injection at the bottom at 45 degrees the vortex created helps improve performance. Now they are using gallons per minute flow rates, so it would be interesting to see how much of an improvement it would make for a lower flow rate.
    1700 litres on 50 watts
    Planned 11,777 litres on 58 watts. 1300l anoxic, 4" airlifts, Solum 16, bio.

  13. #48
    Senior Member Rank = Hassai Twhitenosugar's Avatar
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    Thanks for the info Nick. Although the conclusions of the paper on making a vortex/ swirl of injected water suggests that it made little improvement to flow in most configurations.

    Although others reading this may not want to go into that much detail, it does show that airlifts are backed up by science, and not just a bunch of people on a forum who claim they work.

    I must admit the main reason why i was initially hesitant about using air lifts, rather than a conventional pump, was in case it didn't work, as it seems to good to be true.

    But built in the right way, boy do they work.

    Sent from my SM-A520F using Tapatalk
    13,000L fibreglassed raised pond with window

  14. #49
    Extreme Koi Member Rank = Hassai NickK-UK's Avatar
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    Quote Originally Posted by Twhitenosugar View Post
    Thanks for the info Nick. Although the conclusions of the paper on making a vortex/ swirl of injected water suggests that it made little improvement to flow in most configurations.

    Although others reading this may not want to go into that much detail, it does show that airlifts are backed up by science, and not just a bunch of people on a forum who claim they work.

    I must admit the main reason why i was initially hesitant about using air lifts, rather than a conventional pump, was in case it didn't work, as it seems to good to be true.

    But built in the right way, boy do they work.

    Sent from my SM-A520F using Tapatalk
    Oh yes - there's a massive amount of academic research into airlifts as they are used extensively in industries such as agriculture etc. I was looking at the efficiency of using slugs (bubbles the width of the pipe) rather than a small bubble flow at the side.

    I worked out the lpm air for my 1.75m submerged airlift for 10,000lgh flow rate = 48.69 lpm of air according to the diagram..

    However I'm concerned that it doesn't take into account pipe diameter..
    1700 litres on 50 watts
    Planned 11,777 litres on 58 watts. 1300l anoxic, 4" airlifts, Solum 16, bio.

  15. #50
    Thank You! For the read up, I will have a go at building one later in the Year!

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