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Barr GH Booster

Discussion in 'Estimative Index' started by Steven, Sep 27, 2010.

  1. Steven

    Steven Guru Class Expert

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    Hi,

    Does anyone know how much K, Ca and Mg in Barr GH Booster if I dose 5gr in 90L tank?

    My water has a gH of 2-3 but I don't know how much Ca or Mg in it plus I am dosing K2SO4 and would like to know if I have to reduce the dosing by how much since the Barr GH Booster has K in it.

    I try to follow the EI dosage at sticky for 20-40gal tank is roughly 1/2tsp and when I weighted 1/2tsp was about 1.6gr and after I dose it in my 22.5gal tank, the gH did not rise a bit so I kept adding it until 5gr and gH went from 2-3 to 3-4.
     
  2. Biollante

    Biollante Lifetime Charter Member
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    10.7-ppm K+: 6.6-ppm Ca++: 0.8-ppm Mg++

    Hi,

    Yes! :cool:

    Biollante
     
    #2 Biollante, Sep 27, 2010
    Last edited by a moderator: Sep 27, 2010
  3. Biollante

    Biollante Lifetime Charter Member
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    Apologies for Any Perceived (Or Real) Impertinence

    Hi Steven,

    Sorry I did not give as complete an answer as I should have. :eek:

    The five grams of Barr’s GH Booster will raise the GH of 90 liters of water about 7.4-ppm or a little less than 0.5dGH.

    As a lesser light it is always dicey advising Guru Class experts, though were it me, I would raise the GH at least two more degrees.

    I would do so by adding 10 grams of Calcium chloride dihydrate and four grams of Epsom salts.

    Calcium chloride seems to upset many Guru Types so 10 grams of gypsum with the four grams of Epsom salt will accomplish the two-degree increase in GH. ;)

    Biollante
     
  4. Steven

    Steven Guru Class Expert

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    Thank you Bio,

    Could you please share to me how to count for that? 10.7-ppm K+: 6.6-ppm Ca++: 0.8-ppm Mg++ in 5gr of Barr GH Booster?
    10gr CaSO4 has 30.68ppm Ca in 90L tank
    4gr MgSO4 has 4.38ppm Mg in 90L tank, right?

    And from what I know :
    7.143ppm of Ca will add 1dgH
    4.29ppm of Mg will also add 1dgH
    so 30.68ppm Ca and 4.38ppm Mg will roughly add over than 5dgH, no?

    If my tank gH is 2-3dgH, what do you recommend me to dose, CaSO4 and MgSO4 or Barr GH Booster just fine? Personally, I would like to increase the gH to 4-5dgH and if I target that with Barr GH Booster, I think I will overdose the K, right?
     
  5. Biollante

    Biollante Lifetime Charter Member
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    About 17-ppm GH = 1-dGH

    Hi Steven,

    I will write more tomorrow, but for now…

    7.143ppm of Ca will adds a little less than 0.5-dGH and the 4.29ppm of Mg adds about 0.25-dGH, so together they add a little less than 0.75-dGH. :gw

    No, adding 30.68ppm Ca and 4.38ppm Mg will roughly add less than 2-dGH. ;)

    Yes trying to raise the GH with Barr’s GH Booster will end up adding a lot of Potassium. :eek:

    Biollante
     
  6. Biollante

    Biollante Lifetime Charter Member
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    Oops, My Bad

    Hi Steven,

    {Please pardon my error, in my haste last night I calculated the Calcium as though it were derived from anhydrous Calcium sulfate, which I think unlikely, below I have calculated as the Gypsum I presume is used in Barr’s GH Booster. I just plain messed up the Mg part}

    Barr’s Booster according to the label is 3 parts KSO4: 3 parts CaSO4 (I assume Gypsum): 1 Part MgSO4 (I presume Epsom salt).

    So 7 parts Barr’s Booster minus 3 parts KSO4 and 1 part MgSO4.7H2O leaves 3 parts CaSO4.H2O.
    3 parts CaSO4.H2O divided by 7 parts Barr’s Booster tells us that CaSO4.H2O makes up about 43% of Barr’s Booster. :)

    You added 5 grams of Barr’s Booster to 90 liters of water therefore you added about 2.2 grams of CaSO4.H2O. The molar mass of CaSO4.H2O is 172.17 g/mol, the molar mass of Ca is 40.08g/mol.

    2.2 g CaSO4.H2O (40.08g/mol Ca)/(172.17g/mol CaSO4.H2O))(1/90 L)(1000mg/g)(1-ppm/(1mg/L),
    cancel and combine terms
    2.2 (.23 Ca)(0.011)(1000)(1-ppm) results in about 5.6-ppm Ca or (5.6-ppm /(17-ppm/ dGH)) is about 0.33dGH added to the water column.

    Since 7 parts Barr’s Booster minus 3 parts KSO4 and 3 parts CaSO4.H2O leaves 1 part MgSO4.7H2O divided by 7 parts Barr’s Booster tells us that about 14% of Barr’s Booster is made of MgSO4.7H2O.

    So of the 5 grams Barr’s GH Booster you added multiplied by 0.14 is about 0.7 gram Epsom salt. We find the molar mass of MgSO4.7H2O is 246.8 g/mol and Mg is 24.31 g/mol.

    0.7 gram MgSO4.H2O(24.31g/mol Mg)/(246.8g/mol MgSO4.7H2O))(1/90 L)(1000mg/g)(1-ppm/L)
    cancel and combine terms
    0.7(0.099)(0.011)(1000)(1-ppm) results in about 0.76-ppm Mg or (0.76-ppm/17-ppm/dGH) is about 0.045dGH added to the water column.

    So the total GH increase is 5.6-ppm Ca plus 0.76-ppm Mg is about 6.36-ppm GH or (6.36-ppm/(17/dGH)) about 0.37dGH.

    You added 5 grams of Barr’s Booster to 90 liters of water therefore you added about 2.2 grams of KSO4. We find that the molar mass of KSO4 is 135.16 g/mol, the molar mass of K is 39.01.
    2.2 g KSO4(39.01g/mol K/135.16g/mol KSO4)(1/90 L)(1000mg/g)(1-ppm/(1mg/L),
    cancel and combine terms
    2.2 (.29 K)(0.011)(1000)(1-ppm) results in about 7-ppm K added to the water column, though Potassium does not influence GH.

    Should you opt to add 10 grams of Calcium chloride dihydrate to 90 liters of water
    10 grams CaCl2.2H2O(40.08g/mol Ca)/(147.02 g/mol CaCl.H20)) (1/90 L)(1000mg/g)(1-ppm/L)
    10(0.27 Ca)(0.011)(1000)(1-ppm) adds about 29.7-ppm Ca or about 1.75dGH.

    Or

    Should you as a Guru stick with your Guru Brethren eschew Calcium chloride, for gypsum
    10 grams CaSO4.2H2O(40.08g/mol Ca)/(172.17g/mol CaSO4.H2O))(1/90 L)(1000mg/g)(1-ppm/L)
    10(0.23 Ca)(0.011)(1000)(1-ppm) adds about 25-ppm Ca, about 1.5dGH

    If you add 4 grams of Epsom salt to 90 liters of water you will add
    4 grams(24.31g/mol Mg) )/(246.8g/mol MgSO4.7H2O))(1/90 L)(1000mg/g)(1-ppm/L)
    4(0.099 Mg)(0.011)(1000)(1-ppm) about 4.4-ppm Mg, about 0.26dGH

    Biollante
     
  7. Steven

    Steven Guru Class Expert

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    Wow, I'm not a chemist and I don't understand the calculation that detail but thanks Bio for the detail calculation, now I know how to count the gram or ppm of Barr GH Booster.

    In the end, I will back to my CaSO4 and MgSO4 dosing regime rather than switching to Barr GH Booster which I bought from Aquarium Fertilizer.com that is 14.500km away from me and cost me about US$. 10/lb including shipping cost :( as I will end up overdose the K with it if I target the raise of my gH from 2-3dgH to 5dgH.
     
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