Calcium Carbonate

Discussion in 'Water Parameters and Additives' started by shane, 2 Jul 2009.

  1. shane

    shane

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    Hi all,
    Can I use calcium carbonate powder instead of calcium hydroxide?
    Just a question someone at work asked me.
    Cheers
     
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  3. Tony

    Tony

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    Yes you can but you need to drip it slowly as is doesn't dissolve that easily and it will effect your calcium, alkalinity and magnesium.
     
  4. shane

    shane Thread Starter

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    Cool,
    How would I go about mixing it up ie:what ratio of powder to RO?
    Cheers
     
  5. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Hi Shane.
    Calcium Carbonate or Calcium Chloride?
    Calcium Carbonate CaCo3 is meant for a calcium reactor that dissolves under a low ph by means of injecting Co2 into the reactor, thus dosing Ca and Alk.

    Calcium Chloride can be mixed with RO and dosed into the tank which will raise only Ca and decrease Alk.

    If you wish to dose manually to maintain your Ca and Alk level then go for Calcium Hydroxide AkA Kalkwasser.
     
  6. shane

    shane Thread Starter

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    Hey Mek,
    It was calcium carbonate but in powder form.
    Someone at work just mentioned it today and asked if could be used for calcium supplements in the tank
    cheers
     
  7. Tony

    Tony

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    Mek, you can get calcium carbonate in powder form. Glass world sells it like that. I bought some for Warren a few months back
     
  8. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Cool thanks Tony. Tell me, does it dose just plain Calcium or Alk aswell?
     
  9. Tony

    Tony

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    I'm not sure Mek
     
  10. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Now where's these Gurus when you need one.
     
  11. jacquesb

    jacquesb Retired Moderator

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    Personally - even in powder form - I do not think that the chemical compound, CaCO3, can EVER buffer the water, nor adjust the pH, least of all dose Ca....

    It STILL needs to be broken down to it's lowest chemical denominators (building blocks)......

    Sorry - I am not chemical expert - but, I was 1st on class during my final years in school - in my chemistry classes..... ;)
     
  12. Mekaeel

    Mekaeel Moderator MASA Contributor

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    So you with me on this? Still requires Co2 to be broken down?
     
  13. Tony

    Tony

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    In my book on marine chemistry is says that it can be used but slowly as it doesn't dissolve easily
     
  14. jacquesb

    jacquesb Retired Moderator

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    Yes Mekaeel - I think that it indeed still requires SOME acidity to be broken down to it's lowest chemical building blocks - ie. calcium, carbon and oxygen.....
     
  15. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Ok, so can we conclude by saying, Calcium Carbonate powder cannot be dosed directly in a tank as it will do nothing. It needs to be broken down using a CArx.Well obviously we cant use the powder in a Carx, it will clog up, but rather the stones.
     
  16. jacquesb

    jacquesb Retired Moderator

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    Well Mekaeel - that's my opinion. Thanks for believing me. But, I WOULD prefer it if we can get a second opinion first.....
    Has Mr. Reef Maniac gone hunting yet...
     
  17. Mekaeel

    Mekaeel Moderator MASA Contributor

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    I think he is Jacques. We need Sunburst here.
     
  18. Nemos Janitor

    Nemos Janitor

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  19. jacquesb

    jacquesb Retired Moderator

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    Nemo's Janitor - that thread handled Calcium Hydroxide (CaOH), and Calcium Chloride (CaCL).

    NOT - Calcium Carbonate (CaCO3)....... Calcium carbonate, is what aragonite is made of..... and what "fake" coral pieces are made off synthetically, for Calcium reactors......
     
  20. Nemos Janitor

    Nemos Janitor

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  21. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Well this answers our question.
     
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