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Thema: KHD does NOT correct my alkalinity

  1. #1
    Registriert seit
    28.09.2020
    Beiträge
    31

    Standard KHD does NOT correct my alkalinity

    Hi,

    I have the KHD installed now for 4 days. It measure my alkalinity at 7.5. I have the nominal value set at 8.
    I am using the ADD-on setting:

    Volume change: 3
    Limit for KH Raise: 5
    Limit for KH lower: 5
    Calculated adjustment: 1

    Pump 4 is used to dose the KH solution 24 times a day.
    My KH solution strength is 33.3 ml / 100 liter to raise 1 dKh.
    Correction strength is 16.6 ml / 100 liter

    My tank contains 334 liter. So to raise my Alkalinity from 7.5 to 8 the KHD needs to dose 27.82 ml extra. The calculated adjustment is 1 ml. So after 1 day my Alkalinity should be at 8.

    Why is my Alkalinity still on 7.5. It already should be at 8 now after 4 days?
    Geändert von Adri-DSR (30.09.2020 um 00:06 Uhr)

  2. #2
    Registriert seit
    12.08.2020
    Beiträge
    44

    Standard

    I think your volume change is off. For a 1 dKH deviation, you need ~100ml of your supplement. You have this set to 3ml so a .5 deviation will add 1.5ml of supplement for your next dose.

    With your current setting, you will be adding roughly ~36ml for the day which is less the the nominal .5dkh you would minimally use.

  3. #3
    Registriert seit
    28.09.2020
    Beiträge
    31

    Standard

    Zitat Zitat von arking_mark Beitrag anzeigen
    I think your volume change is off. For a 1 dKH deviation, you need ~100ml of your supplement. You have this set to 3ml so a .5 deviation will add 1.5ml of supplement for your next dose.

    With your current setting, you will be adding roughly ~36ml for the day which is less the the nominal .5dkh you would minimally use.
    Mark, i dose 132 ml a day devided in 24 doses, that is 5.5 ml per dosing. That will keep my alkalinity almost at level. The KHD should take care of the rest.

    To raise 1 dKH I need only 57 ml of my solution. I made a mistake with the strength.
    My tank uses 2.39 dKH per day, that is where the 132 ml per day is for.
    Geändert von Adri-DSR (30.09.2020 um 00:05 Uhr)

  4. #4
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    12.08.2020
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    44

    Standard

    What is your 1dKH deviation setting?

  5. #5
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    28.09.2020
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    31

    Standard

    Which setting is that?

  6. #6
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    12.08.2020
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    44

  7. #7
    Registriert seit
    28.09.2020
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    Standard

    I don't have that setting (control) under my dosing pumps

  8. #8
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    28.09.2020
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  9. #9
    Registriert seit
    12.08.2020
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    44

    Standard

    Looks like you may be using an older software version? Control is in the KHD settings?

  10. #10
    Registriert seit
    28.09.2020
    Beiträge
    31

    Standard

    Yes, there is but my control screen looks different. I am using the KHD Stand Alone kit. And I have downloaded the latest software.

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