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  1. #1

    Airlock in bottom drain

    Hi guys hoping you can help I’m a new koi keeper I installed a spindrift aireated bottom drain.but i keep getting an airlock when the pump is running anyone have this problem



  2. #2
    Quote Originally Posted by Brian H View Post
    Hi guys hoping you can help I’m a new koi keeper I installed a spindrift aireated bottom drain.but i keep getting an airlock when the pump is running anyone have this problem
    No, in short. Would you be able to describe your filter and pump set up in a bit more detail

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  3. #3
    Quote Originally Posted by Brian H View Post
    Hi guys hoping you can help I’m a new koi keeper I installed a spindrift aireated bottom drain.but i keep getting an airlock when the pump is running anyone have this problem
    I have a 2000gallon pond Oase gravity fed drum filter evolution pump and uv an air pump the water level is perfect when nothing is switched on but when the air an pump go on the water level drops I tried turning down the pump but it did not help when you turn off the pump a big air bubble comes out of the bottom drain I have an aireated drain

  4. #4
    Hmmmm. The levels can drop as you get a small increase in pressure due to the pump. It's not much on my pond, maybe 25mm max in filter running levels between pump off and pump flat out. The air bubble you get is slightly odd. Do you have the same issue when only running the pump WITHOUT the air pump? Wondering if the airline pipe to the air dome is leaking??

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  5. #5
    Senior Member Rank = Mature Champion Twhitenosugar's Avatar
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    I agree. The fact you have air coming out of the bottom drain sounds like air is getting into the bottom drain pipe work somehow.

    The other thing to consider is how the pipework is configured. If you have any pipework that goes up, then horizontal and back down again, this will create an area of pipework that will trap air. If you do have that, then the best way to deal with it is to cut into the area of raised pipework and install a t fitting. That way, if air does get caught in that bit of the pipework, it can be vented off.

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    13,000L fibreglassed raised pond with window

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