What type of calcium to dose

Discussion in 'Water Parameters and Additives' started by DUPPIE, 17 Sep 2013.

  1. DUPPIE

    DUPPIE

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    Hi All !



    Just wanted some advice from the experts on the following:
    1. I have calcium chloride (flakes) and calcium hydroxide (very fine powder), which is the better one to use ?
    2. What amount do I add to what amount of R.O. water?
    3. Can I dose continually (replacing daily evaporation losses), or should I only dose when my readings drop to below 400 ppm (currently about 430 ppm) ?
    Thanks !!
     
    Last edited: 17 Sep 2013
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  3. Lord_Blackadder

    Lord_Blackadder

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  4. Bonehead

    Bonehead

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    How long has your tank been running? Most recommend that those calcium salts you are talking about are only used in the early stages. And what Corals do you have? Some have much higher demand than others. Remember that evaporation will increase the concentration of your solubles ie your calcium.
     
  5. Albert Terego

    Albert Terego

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    The Calcium Hydroxide is better suited to dosing to replace evaporated water loss. It is relatively good for MAINTAINING calcium levels for low to medium calcium demand. Also assists in maintaining alkalinity and keeping pH elevated.

    Calcium chloride is a salt, readily soluble in water and is suitable for raising calcium levels. It can also be used as a maintenance chemical to maintain calcium. Will do nothing to your alkalinity or pH.

    Myself personally I have used calcium chloride - it is much easier to use and you don't run the risk of potential problems such as extreme high pH, accidental overdose etc. which may result from improper use of calcium hydroxide.

    But if you read up on both you will see the pro's and con's of each for yourself
     
  6. DUPPIE

    DUPPIE Thread Starter

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    Thanks for the replies guys, still have a few questions:

    • I'm still not sure what amount of calcium to add (how many spoons/grams per how much R.O. water, to make a dosing solution)
    • So I gather that using calcium hydroxide is the better option to top up evaporation losses (I lose about 3 litres per day), is this correct ? Can I dose this on a daily basis, or maybe 2/3 times per week ?
    • I noticed that some of the purple coralline algae has turned white after I stopped dosing (due to not being sure what amount to add) with calcium hydroxide for a while (even after getting a reading of 420 ppm from my Red Sea Pro test kit), does this mean that I should raise the calcium to say 450ppm ? (the tank has about 8 LPS, and 10 SPS corals, and lots of softies)
    Thanks !!
     
  7. mariusmeyer

    mariusmeyer

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    I make a standard solution of 100gr calcium chloride in 1L of RO. You can use the following calculator to see how many grams to dose. If you get the grams then just times it by 10 to get the amount of mls of the stock solution to dose.

    Choose the calcium chloride dehydrate option to see how many grams you need for your consumption.
    http://reef.diesyst.com/chemcalc/chemcalc.html
     
  8. Hammerhead

    Hammerhead

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    Howsit guys any idea what selection to make on the reef chem calculator for magnesium chloride.
     
  9. mariusmeyer

    mariusmeyer

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    Magnesium chloride hexahydrate
     
  10. Hammerhead

    Hammerhead

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    Shot alot
     
  11. Gummi Bear

    Gummi Bear

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    Good Day

    HI All , Does anyone have calcium chloride , so that I can buy.
    Thanks
     
  12. Rossreefer

    Rossreefer

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    Hi Duppies,

    Where did you get the Calcium chloride in Cape Town?
     
  13. Gummi Bear

    Gummi Bear

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    @mariusmeyer
    Hi Marius, Maybe when you do you next supplement maybe we can do a group buy.

    Sorry Doppie don't mean to steal your thread
     
  14. DUPPIE

    DUPPIE Thread Starter

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    Got the calcium chloride (20kg) from a guy who's set-up I bought. He said he bought it from Protea Chemicals. The calcium hydroxide ("geblusde kalk") I buy from Dischem.
     
  15. Rossreefer

    Rossreefer

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    Hi Duppie,

    Would you consider selling one or two kgs of the Calcium Chloride?
     
  16. butcherman

    butcherman Moderator MASA Contributor

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    perhaps the jhb guys need to do a group buy too, this is very interesting
     
  17. Rossreefer

    Rossreefer

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    If any Cape Town guys want to do a group buy let me know. I have contacted Protea Chemicals and they have Pharma grade, I am willing to pick up from them. It really cheap but 25kgs of each (100kgs total) is going to last probably longer than I will still be alive.
     
  18. Charl_Stanhope

    Charl_Stanhope

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    Last edited by a moderator: 26 Nov 2015
  19. Rossreefer

    Rossreefer

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    Hi Charl,

    Ill go get next week after pay day:slayer: and then post a thread.
     
  20. Charl_Stanhope

    Charl_Stanhope

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    @Rossreefer , any update on this ? Im keen for a few kilos of each still.
     
    Last edited by a moderator: 26 Nov 2015
  21. Rossreefer

    Rossreefer

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    Hi Charl

    This issue is this, they come in 25kg bags.

    For Calcium 1.25kgs makes 10 Liters of supplement
    For KH 0.5lgs makes 10 Liters of supplement
    For Magnesium 1.75kgs of Magnesium Chloride and 0.25KGS of Magnesium Sulfate makes 10 liters of supplement.

    So you can see how far the 25kg bags will go.

    So even if you split this between 5 people then you are going to have enough chemicals for a LONG time.

    One could leave the Magnesium Sulfate as very little is needed and you could use Epson Salts from your Pnp or Pharmacy when doing the mix.

    I would be prepared to get the chemicals and package them in 5 kg amounts but would need you, I and three other people to go into the deal.

    If we do just the Calcium Chloride, Sodium Bicarbonate, and Magnisium Chloride then we would be looking at R150 per person. Add an extra R50 per person for my costs for packaging (I would get it vacuum sealed)

    Let me post a thread now, and see how many people in Cape Town are interested.
     
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