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Thread: KHD siphon waste water from drain?

  1. #1
    Join Date
    05.12.2019
    Posts
    11

    Default KHD siphon waste water from drain?

    Hello.

    When I checked my KHD today I noticed some odd measurements and went to check on the machine.

    All hoses where filled with water and I couldnt empty them. Found out that the waste hose was placed in the drain. Probably beneath waterline. Pulled it up and the machine was able to empty as normal.

    My question.

    IF the waste line was below surface of my drain would that mean KHD siphoned water from the drain inside the KHD and then also back into the aquarium?

    Feeling nervous about this.

  2. #2
    Join Date
    10.10.2013
    Posts
    989

    Default

    Hello,

    It is not normally possible for water to returnto KHD from the Wast outlet. The peristaltic pump prevents this.
    On the other hand, the ventilation tube at the rear must not be able to suck in water under any circumstances, so it must be placed high enough.

    Gaël
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  3. #3
    Join Date
    05.12.2019
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    11

    Default

    Quote Originally Posted by Gael View Post
    Hello,

    It is not normally possible for water to returnto KHD from the Wast outlet. The peristaltic pump prevents this.
    On the other hand, the ventilation tube at the rear must not be able to suck in water under any circumstances, so it must be placed high enough.

    Gaël
    Sorry for bad english / explanation.

    I ment the tube going from the back. What would happen if that was beneath the water line?

    I think that the hose from the back may have fallen down into the drain and submerged into the water in the drain.

  4. #4
    Join Date
    10.10.2013
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    989

    Default

    The instruction manual clearly states that the rear tube must NOT be able to draw in water.
    Please make the necessary adjustments.

    Gaël
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  5. #5
    Join Date
    05.12.2019
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    11

    Default

    Hello again.

    I checked the test log and it seems like this have been a problem the last three tests. My sample volume is set to 100 ml.

    If this means that around 400 ml drain water have been sucked back into the aquarium that would be estimated to 1,5 / 10000 part of my entire water volume.

    What do you recommend I do further?

  6. #6
    Join Date
    05.12.2019
    Posts
    11

    Default

    Quote Originally Posted by Gael View Post
    The instruction manual clearly states that the rear tube must NOT be able to draw in water.
    Please make the necessary adjustments.

    Gaël
    I know this.. I was not intentional.

    It had fallen down somehow. I have the waste and ventilation hose placed up on a grid over the drain. When I looked today it had found it's way into one of the holes in the grid.

    Is there something I should do to prevent contamination/pollution for the aquarium or the probe?

  7. #7
    Join Date
    05.12.2019
    Posts
    11

    Default

    Nobody knows what would happen if the vent hose was submerged?

    Will it siphon water back to the aquarium?

  8. #8
    Join Date
    10.10.2013
    Posts
    989

    Default

    Non it will not siphon water back to the aquarium
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