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Thread: Potassium Nitrate 5% solution: how much to dose?

  1. #1
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    Potassium Nitrate 5% solution: how much to dose?

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    Hi,

    was never good with my Chemistry. Appreciate if someone could help me out here.

    Since KNO3 is not sold in powder form, I was only able to buy it in Liquid 5% form from Ecohydroponics.

    Assuming my tank is 400L capacity, for every 10ml of 5% Liquid KNO3 I does, what is the ppm for K & N that I'm adding?

    I looked at the various dosing calculators online but they're all for powder, not 5% liquid. I don't know what 5% means either, is it by gram or ml?
    Cheers
    Boon Yong

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    Re: Potassium Nitrate 5% solution: how much to dose?

    you can follow the PPM calculations on the bottle itself. i recall it being written there. Just got to do some math to customise it to your tank size (400L in your case).

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    Re: Potassium Nitrate 5% solution: how much to dose?

    Quote Originally Posted by cheeboonyong View Post
    Hi,

    was never good with my Chemistry. Appreciate if someone could help me out here.

    Since KNO3 is not sold in powder form, I was only able to buy it in Liquid 5% form from Ecohydroponics.

    Assuming my tank is 400L capacity, for every 10ml of 5% Liquid KNO3 I does, what is the ppm for K & N that I'm adding?

    I looked at the various dosing calculators online but they're all for powder, not 5% liquid. I don't know what 5% means either, is it by gram or ml?
    Hi,

    I was searching and managed to find the answer

    Refer to this link:
    Dr Mallick NO3 Solution
    http://www.aquaticquotient.com/forum...d.php?t=123243




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  4. #4
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    Re: Potassium Nitrate 5% solution: how much to dose?

    {It is written on the label that 10ml of 5% KNO3 liquid to 100litres gives 31ppm of Nitrate and 19ppm of Potassium}

    So, 10ml to 400 L gives me 7.75ppm of N and 4.75ppm of K, am I right?

    This makes it much easier to understand
    Cheers
    Boon Yong

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    Re: Potassium Nitrate 5% solution: how much to dose?

    Quote Originally Posted by cheeboonyong View Post
    {It is written on the label that 10ml of 5% KNO3 liquid to 100litres gives 31ppm of Nitrate and 19ppm of Potassium}

    So, 10ml to 400 L gives me 7.75ppm of N and 4.75ppm of K, am I right?

    This makes it much easier to understand
    Maybe a lot will disagree with me, But I think the label is wrong

    Based on my calculation and many of the fert calculators, 10ml of 5% KNO3 liquid to 100litres give 3.1ppm of Nitrate and 1.9ppm of Patassium.


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    Re: Potassium Nitrate 5% solution: how much to dose?

    Hmm...seems like you're right. If I key in 0.5 gm (instead of 10 gm, given it's 5% concentration), it gives me 3.1ppm of Nitrate. I'm assuming it's 1gm = 1ml (same as water density but I know it's not. Shouldn't be too far off though)

    Seems like not much bang for the buck then.

    Think I might switch to dry (Calcium Nitrate + Potassium Sulphate) instead, instead of liquid Potassium Nitrate (5%).
    Cheers
    Boon Yong

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    Re: Potassium Nitrate 5% solution: how much to dose?

    Quote Originally Posted by cheeboonyong View Post
    Hmm...seems like you're right. If I key in 0.5 gm (instead of 10 gm, given it's 5% concentration), it gives me 3.1ppm of Nitrate. I'm assuming it's 1gm = 1ml (same as water density but I know it's not. Shouldn't be too far off though)

    Seems like not much bang for the buck then.

    Think I might switch to dry (Calcium Nitrate + Potassium Sulphate) instead, instead of liquid Potassium Nitrate (5%).
    Still one of the cheaper source for N.

    If u wanna use Calcium Nitrate, u have to take into consideration that Calcium will raise GH over time. If u have live stock that is sensitive to GH, then that is not a good alternative


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    Re: Potassium Nitrate 5% solution: how much to dose?

    hey i'm using calcium nitrate too as my nitrate source. don't mix calcium nitrate with other sulphate into 1 bottle as it will precipitate quickly into calcium sulphate. I learnt it the hard way.


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    Re: Potassium Nitrate 5% solution: how much to dose?

    Folks,

    I wrote to Ecohydroponics who are the retailer for HPC. They have called back to confirm that their label is indeed wrong. A very polite customer service lady went back to check and confirmed it for me.

    It is written on the label that 10ml of 5% KNO3 liquid to 100litres gives 31ppm of Nitrate and 19ppm of Potassium

    The correct concentration is 3.1ppm Nitrate and 1.9ppm Potassium per 10ml to 100 Litres.

    Guess that clears it up.
    Cheers
    Boon Yong

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    Re: Potassium Nitrate 5% solution: how much to dose?

    Just to add, she stressed that by law, they are not allowed to sell the solution above 5% concentration.
    Cheers
    Boon Yong

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    Re: Potassium Nitrate 5% solution: how much to dose?

    Quote Originally Posted by cheeboonyong View Post
    Folks,

    I wrote to Ecohydroponics who are the retailer for HPC. They have called back to confirm that their label is indeed wrong. A very polite customer service lady went back to check and confirmed it for me.

    It is written on the label that 10ml of 5% KNO3 liquid to 100litres gives 31ppm of Nitrate and 19ppm of Potassium

    The correct concentration is 3.1ppm Nitrate and 1.9ppm Potassium per 10ml to 100 Litres.

    Guess that clears it up.
    Nice one


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    Re: Potassium Nitrate 5% solution: how much to dose?

    So disappointing. I just ordered 2 bottles of KNO3 and the labels changed to 100ml of 5% KNO3 to 100Litres gives 31ppm of Nitrate and 19ppm of potassium, which means to follow EI dosing, one 1L bottle($14+) can only last about 2 weeks only for a 400L tank.... Rather go back to Calcium Nitrate and Potassium Sulphate combination....

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    Re: Potassium Nitrate 5% solution: how much to dose?

    If not keeping GH sensitive live stock, Calcium Nitrate is a good option


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    Re: Potassium Nitrate 5% solution: how much to dose?

    Actually if you have friends in JB, you can buy KNO3 powder in Malaysia, mixed it with RO water, to make 5% solution, and bring it in to Singapore. I think that is legal right? What do you guys think?

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