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Fertfriend TMG verification (for Laith and whomever)

Discussion in 'Advanced Strategies and Fertilization' started by Wet, Jun 22, 2006.

  1. Wet

    Wet Lifetime Members
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    From quenton's calc thread.
    FertFriend is functionally correct.

    I have to brush up on php for work, so put together a calc to verify. I used this page's percent solution equivalents to veify conversion from percent solution to g/100mL:
    http://antoine.frostburg.edu/chem/senese/101/solutions/faq/dilute-percent-to-ppm.shtml
    and
    http://homepages.gac.edu/~cellab/appds/appd-a.html
    (first two on a google search)

    This also coincides with Steve Pituch's mysterious *10 constant in the solution formula on his computations page.

    % solution = grams/100mL
    TMG is .07%Fe = .070g Fe/100mL = .7mg Fe/mL

    .7mg Fe/mL * 38mL dose / (55gal * 3.785L/gal) = .128mg/L Fe

    Here's my online calc. It rounds to three sig figs:
    http://justanothertank.com/calcs.php#TMG

    Please correct me. If anyone wants my php code just ask. :)

    edited: spellin'
     
  2. Wet

    Wet Lifetime Members
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    Re: Fertfriend TMG verification (for Laith and whomever)

    Hmmm. MyTMG says "W/W% (Gew./Gew. %, P/P%)" and lists mass for volume. W/W means weight over weight, not weight over volume, so this means the percentage Fe listed is calculated from mass?

    From TMG bottle: 250mL = 260g
    TMG = 1.04g/mL = 1040mg/mL

    mL dose * 1040mg/mL * .0007mg Fe/mg TMG / (tank gal * 3.785L/gal) = Fe ppm

    38mL * 1040mg/mL * .0007mg Fe/mg TMG / (55gal * 3.785L/gal) = .133ppm Fe

    Indicating FertFriend is correct and my using percentage of solution for mass/volume above and on the calc is incorrect.

    Yes?
     
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