KH Through the roof

Discussion in 'Water Parameters and Additives' started by Franske, 15 Nov 2008.

  1. Franske

    Franske

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    Hi can anyone help me please,I dosed baking soda and kalkwasser last night and today my alk sits at around 22 dkh,but my corals and fish seems fine
     
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  3. Tobes

    Tobes Retired Moderator

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    Why on earth did you dose baking soda AND kalkwasser? How much was your kH before dosing?
     
  4. Andreas

    Andreas

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    I would think that a water change will be in order otherwise your calcuim will drop down
     
  5. Franske

    Franske Thread Starter

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    My kh was 7,should the kh stabilize after a while,what affect does baking soda have on your calcium,wil the kh be fatal as it is now
     
  6. Warr7207

    Warr7207

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    Baking Soda, won't do anything to your Calcium levels.

    I would say high kH levels like this are not good, you need to do WC to get it down
     
  7. Franske

    Franske Thread Starter

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    OK cool thanks ill do thank,think it must have been some reaction between the baking soda and kalkwasser,not good,but so I learn the hard way
     
  8. Warr7207

    Warr7207

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    general rule of thumb, use Kalk for Calcium and pH. Use Baked Soda for kH only.
     
  9. viper357

    viper357 Admin MASA Contributor

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    To be honest, there is nothing wrong with a dKH of 7 and I wouldn't worry too much about dosing to increase it, simply dose to maintain it.

    Also try to dose your additives separately and with a few hours inbetween each dosing, i.e. dose one thing in the morning and the next in the afternoon.

    For now, do a couple of good water changes and that should bring everything back down to normal again. Don't dose anything else until your readings are back in check.
     
  10. Obi-Wan

    Obi-Wan

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    test, retest, and wait before you DECIDE....

    I have had tanks that high before without concern, on the otherhand Ca, Mg, Sr become tricky to maintain.

    Wait, to confirm your alk readings, with a better/someone else's kit????

    Take the advice offered earlier on the forum.

    Avoid dangerous "combo" dosing UNLESS you are certain of the effects, interactions, and consequences.


    DO test for Alk, Ca, pH,sg to ascertain where your safety margins are.

    ONLY, IF you observe elevated KH placing stress on your livestock, and you feel you MUST do something to reduce it.....read below



    ONLY if you are confident of your ability, do the below.

    Water changes CAN reduce alkalinity BUT will waste much water.( Brand/batch dependent, freshly mixed water should have moderate alkalinity, about 8-10kH)

    OR

    Use Acid to quickly consume excess carbonate, hence alkalinity will lower and desirable alkalinity will be re-established.

    OR

    ONLY use unbuffered RO for all topups for about 2wks.
    (Use NO kalk , baked bicarb, whatsoever)

    Your 22kH is approx 8mEq/L

    Assume your salinity is closest 35ppt/1.024 near Temp 25C .

    ONLY If it is below 1.023, READJUST, with 1day settlement at sg more resilient, for easier management .

    THEN

    30ml HCl ~32%
    prediluted( in about 300ml RO water), will reduce 300L by 3kH( almost 1 mEq/L)

    SLOWLY ADD dose and wait an hour to retest alkalinty.
    I suggest SLOW 20minute drip by airline syphon over 1st stage of sump.

    ENSURE VIGOROUS aeration applied to sump while you try reducing your alkalinity.

    Redose, retest...remember min 1h intervals.

    When you are just under 15kH , LEAVE it there.


    Natural processes will balance things out for you.



    IMPORTANT

    DON'T UNDERTAKE unless suitably supervised, or with due caution.

    SAFETY FIRST


    <HCl =Hydrochloric = muriatic = pool acid>
    ask a chemist/pharmacist, obtain from a poolstore

    wear protective clothes,eyewear, gloves.

    Predilution: Add acid to RO water (5ml in 300ml RO), may get warm.

    ENSURE your testkits are reliable enough to base these drastic measures on!!!!

    Great,if you find this helpful
    If hesitant, rather just wait it out and regularly report back here.
     
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  11. dogstar

    dogstar

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    no meant o hijack this thread, but my kh has gone down to 5 dkh. What to i do to bring it up to 8 dkh? (tank only has live rock and aragonite subtrate, no livestock apart from the hitch hikers) about 350litre tank

    I do not want to make a mistake and end up with a kh that is too high? Also i dont want my pH to drop, its at 8.2 at the moment.

    What must i add, and how much of it, how do i add it?
     
  12. Franske

    Franske Thread Starter

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    You can ad baking soda as a buffer,there is a mix between cooked and normal baking soda that doesnt affect your ph at all,guys if I may ask what affect wil only dosing slaked lime into your tank have,and not mixed with vinegar,thanks for the help obi-wan,but I stil want to know what the cause of the high alk is,I only dosed 100g baking soda and 50 ml kalkwasser mix in a 250l system
     
  13. Reef Maniac

    Reef Maniac MASA Contributor

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    that's way more than 1000dKh per liter (at a rough guess, have not actually checked the calcs...) - no wonder the alkalinity increased so much. You are supposed to add one or two teaspoons of baking soda dissolved into a liter of water into your tank over a period of time (hour or so...), what made you add 100g of the stuff all at once?

    Good advice there from Obi-Wan :thumbup:

    Hennie
     
  14. Franske

    Franske Thread Starter

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    I dont know read somewhere that I should add 157 grams of baking soda to one liter of ro and then dose that,must you drip it then
     
  15. Reef Maniac

    Reef Maniac MASA Contributor

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    LOL, yes, that's to make the concentrated "stock solution" - you then add (say) 50ml of that solution to your tank every day (depending on alkalinity demand...)

    Hennie
     
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