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Thread: Big bubble forming in doser to reagent tube??

  1. #21
    Join Date
    18.02.2009
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    Kaiserslautern
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    7,710

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    Thanks for details, helps to see clearer.
    So yes I agree, the deviation (> 10) comes from the bubble.

    Any chance you could use a thinner tube (e.g. ID = 2mm)? This will still fit on the doser fitting.

    Still try to get rid of the air in the reagent - make it a bit warm (e.g. 30 - 40°C), shake it carefully
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  2. #22
    Join Date
    26.01.2018
    Location
    Genoa
    Posts
    1

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    I to am having bubbles form in the tube supplying the KH director. Is it possible the reagent is reacting with the tubing supplied with the director?

    i purchased a clear dosing container specifically for the reagent and the bubbles are only forming in the tubing supplied with the director

  3. #23
    Join Date
    13.08.2010
    Posts
    4,150

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    Info from the German forum
    A silicone hose with a thicker wall, or ptfe hoses solved the problem. obviously, "normal" silicone hoses are not diffusion-proof enough.

    regards Pit

  4. #24
    Join Date
    05.02.2017
    Location
    Funchal, Portugal
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    5

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    Quote Originally Posted by PIWAWT View Post
    Info from the German forum
    A silicone hose with a thicker wall, or ptfe hoses solved the problem. obviously, "normal" silicone hoses are not diffusion-proof enough.

    regards Pit
    ptfe hose ? is that aquarium co2 hose ?

  5. #25
    Join Date
    27.01.2017
    Posts
    42

  6. #26
    Join Date
    10.10.2013
    Posts
    994

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    Quote Originally Posted by Matthias View Post
    Thanks for details, helps to see clearer.
    Any chance you could use a thinner tube (e.g. ID = 2mm)? This will still fit on the doser fitting.
    Quote Originally Posted by PIWAWT View Post
    Info from the German forum
    A silicone hose with a thicker wall
    regards Pit
    I have silicone tube with 2mm inner and 5mm outer and same problem...
    Also even if this would solve the problem (which is not the case), nothing could be done with the hose in the head of the dosing pump and the hose inside the KH Director.
    it is hopeless...

    20180326_194951.jpg

  7. #27
    Join Date
    06.07.2013
    Posts
    61

    Default

    Same here. I used thick wall silicone airline and have also heated the reagent to 40c and given it a shake. The problem remains the same.

  8. #28
    Join Date
    22.07.2017
    Posts
    14

    Default

    OK, so the 2mm ID silicone tube and heating the reagent does not solve the air bubbles forming. Are we looking at a design problem here? How do we solve this?

    Quote Originally Posted by Mortie31 View Post
    Lets hope Mortie31 has positive feedback soon then GHL can send out PTFE tubes to all.
    Last edited by Fishbones; 26.03.2018 at 19:18.

  9. #29
    Join Date
    06.07.2013
    Posts
    61

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    Does GHL have any solution to the bubble problem yet?

    This has been a issue since the start of KHD.

    It would be nice to have some updates so at least we know that it is still being looked into.

  10. #30
    Join Date
    05.02.2017
    Location
    Funchal, Portugal
    Posts
    5

    Default

    I think I found the right tube... but I need one more week of testing but haven't seen a bubble for 1week and a half.

    Pedro

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