Reason and solution low KH

Discussion in 'Water Parameters and Additives' started by Mc, 9 Mar 2012.

  1. Mc

    Mc

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    Hi All

    I have been having a problem with low KH and I have been dosing brightwells reef code B to try raise it, which doesn't seem to be working that well.
    What Im wondering is if there is a better solution and also what causes the KH to drop, it has never been a problem before.
    At the moment my KH is 6 and my pH is 8.0.
    The calcium is still at it normal level of 440.
     
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  3. Tremayn

    Tremayn

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    Whats your Mg level at? Kh, Ca and Mg are all related. Having low Kh may be a symptom of low Mg
     
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  4. Tobes

    Tobes Retired Moderator

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    What salt are you using?

    I took two teaspoons bicarbonate of soda mixed in a 2l bottle with RO water. I then made a hole in the cap and insert a 6mm pipe normally used for top ups ,etc. Put on top of your tank or above sump and suck the pipe until siphon starts, then restrict to a drip with a valve or clamp. It raised my kH from around 6 to 8 and the next day to 10. Drip slowly and keep monitoring.
     
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  5. Mc

    Mc Thread Starter

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    Thanks @Tremayn I will test it I didn't know the magnesium was also related.

    @Tobes I am using red sea coral pro salt. How did that effect your pH?
     
    Last edited by a moderator: 26 Nov 2015
  6. Tobes

    Tobes Retired Moderator

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    I dripped it at night as the pH drops when the lights are off, so no change really, except going up to what it was during the day. This was on my old setup.
     
  7. Tobes

    Tobes Retired Moderator

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    If remember correctly, it was 8.2 during the day and 8.0 at night, measured with a digital pH meter
     
  8. Mc

    Mc Thread Starter

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    I will try that thanks.
     
  9. LuckyFish

    LuckyFish MASA Contributor

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    It is not advisable to raise the KH more the 1 degree per day.
    You need to add 3 gram of bicarb (baking soda/sodiumhydrogencarbonat/NaHCo3) to raise the KH by 1 degree for every 100 litre volume of the system. Baking soda has got the tendency to drop the PH slightly over a longer period of usage.
    To raise KH and PH, you should add 1.9 gram of sodiumcarbonat (washing soda/Na2Co3) to raise the KH by 1 degree for every 100 litre volume of the system. Washing soda has got the tendency to raise the PH slightly over a longer period of usage.
    If you don't have washing soda, but baking soda, you can spread some baking soda onto a oven tray, put it by 200 degrees into the oven for 30 minutes. The hydrogen will go out of the baking soda and you will have washing soda.
     
    Last edited: 9 Mar 2012
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  10. Mc

    Mc Thread Starter

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    How much do you think 3 gram is in teaspoons? sorry I don't have such a sensitive scale.
     
  11. LuckyFish

    LuckyFish MASA Contributor

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    What is your total volume of your system?
     
  12. Tremayn

    Tremayn

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    no prob dude. Coral pro is a nice salt. Are you wanting to start keeping sps?
     
    Last edited by a moderator: 26 Nov 2015
  13. Mc

    Mc Thread Starter

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    @LuckyFish It is about 140L but I have a lot of live rock so maybe 120L

    @Tremayn Yeah I already have a few frags.
     
    Last edited by a moderator: 26 Nov 2015
  14. LuckyFish

    LuckyFish MASA Contributor

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    @Mc

    add 10 gram bicarb to 1 litre RO water. Add every day 1/3 litre to your system. Your KH will be in 3 days up at 9 degrees.
    10 gram bicarb is roughly equal with 10ml.
     
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  15. Mc

    Mc Thread Starter

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    Thanks luckyfish and that won't mess up the pH or anything else too much?
     
  16. LuckyFish

    LuckyFish MASA Contributor

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    No. But you have to check your magnesium. It seems you have a lack in MG.
    1350mg/l should be the desired level.
     
  17. Mc

    Mc Thread Starter

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    Ok Im gonna look for a MG test kit tommorrow as I don't currently have one so that could be the problem. If that is the case then that reef code A supplement from brightwell that I have should help as it contains magnesium.
     
  18. Express Reef

    Express Reef

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    Rather get Aquavitro (Seachem) 8.4 eight.four... is much safer trust me...
     
  19. brentch

    brentch

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    Just remember, when raising kH, first add the Mg then wait about a half hour to an hour, then add the buffer (bicarb or whatever you are using). Don't add it all at once.
     
  20. LuckyFish

    LuckyFish MASA Contributor

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    @Mc

    On the other hand, you have only 120 litre total volume and I reckon you do regular water changes.
    From that point of view I doubt that you will have a lack in Mg. A magnesium test kit cost a lot, so maybe your LFS can do a once off test.
    Does brightwells product give you a clear indication how much you have to add to raise the KH by 1 degree?
     
    Last edited by a moderator: 26 Nov 2015
  21. Tony

    Tony

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    If your tank is so small, do a massive 70 percent water change. It should help things but you need to establish your calcium and magnesium levels as magnesium holds calcium and alkalinity in solution
     
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