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Kh very high please help

Discussion in 'New to Reefing' started by Dannyrb26, May 27, 2011.

  1. Dannyrb26

    Dannyrb26

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    ive done 4 water chages between 10-15litres each from a 200litre tank with no decrease in kh can some1 please help me?:frustrat:
     
    Dannyrb26, May 27, 2011
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  2. Dannyrb26

    little_fish Moderator

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    Are you sure your test kit is accurate? What is the alk of your newly made saltwater?

    Also, what your calcium and magnesium levels? Those all are interconnected, and if one is off, it very hard to get the other two to be correct.
     
    little_fish, May 27, 2011
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  3. Dannyrb26

    ccCapt Reef Hacker Moderator

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    What's your current alk reading and what brand salt are you using?
     
    ccCapt, May 27, 2011
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  4. Dannyrb26

    Dannyrb26

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    everythin else is fine kh is at 16 usin rea sea coral life salt with 4.2kh
     
    Dannyrb26, May 28, 2011
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  5. Dannyrb26

    ccCapt Reef Hacker Moderator

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    I would have to say your test kit is bad.
    I'm not sure which salt you are referring to, but typically Red Sea salt mixed to about 8 dKH and Coralife salt mixes to about 9 dKH. There is no salt made that mixes to such a low alk reading of 4.2 dKH.
     
    ccCapt, May 28, 2011
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  6. Dannyrb26

    Dannyrb26

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    red sea coral pro salt alk 4.2 says on the front of the bucket
     
    Dannyrb26, May 28, 2011
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  7. Dannyrb26

    ccCapt Reef Hacker Moderator

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    The 4.2 on the bucket is meq/l. Did you actually test a fresh mix? What brand test kit are you using?

    Alkalinity can be measured in 3 different readings depending on the brand test kit you are using.
    dKH - degrees of karbonate hardness
    meq/l - milliequivalents per liter
    ppm - parts per million

    4.2 meq/l = 11.8 dKH = 210 ppm
    16 meq/l = 44.8 dKH = 800 ppm

    So doing some math.....
    your current alk is 16 dKH (which I find hard to believe and still think it's a bad test kit)
    you did a 5% water change (10 ltr of 200 ltr total) using water with an alk level of 12 dKH
    you dropped your alk from 16 dKH to 15.8 dKH

    Taking into account the accuracy of hobby grade test kits, that small change most likely won't even be noticable.
     
    Last edited: May 29, 2011
    ccCapt, May 29, 2011
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  8. Dannyrb26

    Dannyrb26

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    its a new red sea test kit and ive had it tested by the aquarium shop here and got the same reading with red sea and api kits...and i used tap water as i dont have a source of RO water im in australia
     
    Dannyrb26, May 29, 2011
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  9. Dannyrb26

    ccCapt Reef Hacker Moderator

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    Are you adding any supplements? If you are using salt that mixes to aprox 12 dKH, it can't go higher without something being added to it.

    Doing a quick Google search, there are many places in Australia that sell RO units.
    The Water Shop :: Reverse Osmosis Systems
    Reverse Osmosis - PSI Water Filters
    Water Filter Housings - Filter Wizard Water Purifiers
    erse OsmosisWater Filters Purification – Buy Reverse Osmosis, Fluoride Removal, Ultra Violet Filter, Ionisers – Water Filter World Australia
     
    ccCapt, May 30, 2011
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