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Approximate PPM per dose?

Discussion in 'Estimative Index' started by longhornxtreme, Jan 28, 2008.

  1. longhornxtreme

    longhornxtreme Lifetime Members
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    Hi all,

    I was wondering if anyone could tell me what the approximate PPM added to the tank for N,P,K for each dose (3x a week)? I'm wanting to mix up my own solutions to work with and I can do the rest of the math myself, but I don't know how many Grams are in each teaspoon measurement.

    Thanks in advance
     
  2. Tom Barr

    Tom Barr Founder
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    All dosing calculators have them built in.
    So you can use those.

    You can also use a density of the substance and that the 1/4 teaspoon = 5mls or 5 cc's.

    Per week:
    I generally add about 20-30ppm of NO3 via KNO3, maybe less if the fish loading/feeding is high or light is low etc.
    I add about 3 ppm of PO4.
    And about 20mls of Traces(TMG as a standard) per 80 liters of tank volume.

    That should provide non limiting levels and with a weekly 50% water change, you are not going to build up that high.

    If you wish to target specific ppm's, then you should use the EI dosing cal:

    Nutri-Calc[v1.9.3 Mar 10/07]: an EI Dosing Calculator & Tank Size Calc
    http://www.cherniaksoftware.com/home.../NutriCalc.exe

    Or use the search function here.

    It should pop up.

    Regards,
    Tom Barr
     
  3. longhornxtreme

    longhornxtreme Lifetime Members
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    Well... it seems that the nutri calc link is dead.

    Thanks for your explanation Tom. I've got my micro dosing sorted out, I just wanted to try out your macro dosing for a bit. I use a combination of CSMB and Flourish for micros, and as soon as what I have left runs out I'll try out TMG.

    So it's safe to say that each dose should have

    20 - 30 ppm NO3 a week / 3 doses = ~8ppm NO3 / dose
    3 ppm PO4 a week / 3 doses = ~ 1 ppm PO4 / dose

    I tend not to trust calculators for these simple chemistry calculations as either the software is buggy, or a decimal place is off etc. Gives me a reason to use my chemistry minor for fun.

    THanks!
     
  4. Sumo

    Sumo Junior Poster

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  5. Tom Barr

    Tom Barr Founder
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    Good old school is the best.
    I still do it that way, even with spread sheets and all.
    Old habits.

    Regards,
    Tom Barr
     
  6. tim85

    tim85 Junior Poster

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    I have just started dosing 3tsp KNO3 and 1tsp KH2PO4 for my 180g on Sundays (50% wc) , Tuesdays and Thurdays. I also put in 1tsp CSM+B on Mondays, Wednesdays and Fridays.

    According to Chuck's calculator I am doing like 15ppm NO3 and 5ppm PO4 on EACH of the 3 days of dosing. I have 1.6wpg of light and pressurized CO2. Fish load is low. Am I dosing too much ?
     
  7. ccLansman

    ccLansman Guru Class Expert

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    YES, your light is low. I would watch out, 1 tsp KH2 seems over kill, if its 1/2 KN03 to 1/8KH2 on a 60 gal, if we x3 for 3x the tank vol i would see 1.5 and 3/8...
     
  8. timmo11

    timmo11 Junior Poster

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    Tom I think this is a typo unless US teaspoons giant sized?

    1/4 metric teasponn = 1.25mL

    Tim
     
  9. Tom Barr

    Tom Barr Founder
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    Yes, 1.25mls not 5mls, yes, it's a typo. Thanks for catching it.

    Reagrds,
    Tom Barr
     
  10. Martin

    Martin Lifetime Charter Member
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    In Nutricalc... do you guys know the percentage of N in KNO3 etc?

    the ferts sold in the States differ quite a lot from what I can buy..

    here it's 13,7%N I believe it is a lot higher in the States?

    what % does Nutricalc use?
     
  11. Tom Barr

    Tom Barr Founder
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    % N or % NO3?

    That will make a large difference.
    Most talk about NO3 ppm's, not N. Research tends to talk N and farmers do as well.

    14 grams/mol for N, 101gram/mol for KN03=> ~ about 13.9% N, per gram of KNO3.

    Sounds like the same stuff, KNO3 is KNO3 the world over.

    Regards,
    Tom Barr
     
  12. Left C

    Left C Lifetime Members
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    Did you find it? If not, here is the link.

    I had to find it so that I could reinstall it. Dern Geek Squad. :mad:
     
  13. Martin

    Martin Lifetime Charter Member
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    Hi Tom..

    Well.. when looking at Chuck's calculator he lists it as:

    K - Potassium 38.7%
    NO3 - Nitrate 61.3%


    I'm talkin NO3 of course..
     
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