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Thread: Which one is kh and gh?

  1. #1
    Nisai
    Join Date
    Feb 2008
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    146

    Which one is kh and gh?

    I am trying to buy a good kh and gh test kit from Hanna but not sure which one. I thought kh refers to carbonate and bicarbonate ions and gh is the total of calcium and magnesium salts.

    HI 3820 Acidity - Range (0-100 mg/L) (0-500 mg/L)

    From the website above which is kh and which is gh? it seems like both alkalinity and hardness test calcium carbonate. I am confuse.

    Regards
    Mark

  2. #2
    MCA
    MCA is offline
    Honmei MCA's Avatar
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    Dec 2003
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    yes kh is the carbonates/alkalinity and gh is the general hardenss most from calcium and magesium salts.

    Suggestion: Get a Tetra Larborett kit. Dirt cheap and a good way to get started.

    Walmart.com : Tetra Laborett Master Aquarium Water Test Kit : Fish


    If you want to step up to higher quality test products, you want Hach and Lamott.

  3. #3
    Nisai
    Join Date
    Feb 2008
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    I wanted to buy Lamotte but also hit the same problem. If you look at their website both the alkalinity and hardness test for CaCO3 which is kind of confusing

    Here is the link
    Water Testing Kits: Aquaculture & Fish Farming Products - © LaMotte Company

    I need an accurate test as i will be installing an R/O system.

    Mark

  4. #4

  5. #5
    Nisai
    Join Date
    Feb 2008
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    But on the website that i posted, both written as CaCO3. Can i safely say that the Lamotte alkalinity is kh and the hardness is gh? Could the hardness at lamotte refer to TDS? I dont want TDS because i already got a meter for that.

    Mark

  6. #6
    Daihonmei MikeM's Avatar
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    Dec 2003
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    Orlando, Florida
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    11,128
    Yes, the Lamotte KH is the alkalinity, and GH is the general hardness. Neither measures TDS... both measure a component of TDS, but not Total Dissolved Solids.

  7. #7
    Nisai
    Join Date
    Feb 2008
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    146
    Thank you so much Mike! I just needed an answer like that. Now i can go and buy it in peace.

    Thanks again
    Mark

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