Stock Solution for Phos?

Discussion in 'Planted Tank Equipment' started by Kryo, Nov 26, 2013.

  1. Kryo
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    Kryo Green fingers

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    Hi Guys

    How do you make a stock solution of Phos using Lenolax? I want to make a high concentrate solution using 500ml Distilled water but unsure of how much (Mg/ppm) I'll end up with once diluted with the water. If that make sense!

    Thanks in advance

    Cher
     
  2. Puntius
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    Puntius Green fingers

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    Use the APSA fert calculator;D
     
  3. tyronegenade
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    tyronegenade Specialist

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    See http://home.intekom.com/pharm/lennon/lenolax.html

    Each ml has 60 Mg Sodium Phosphate Heptahydrate and 160 Mg Sodium Acid Phosphate Monohydrate. The former is 35
    % phosphate and the latter is 69% phosphate, so that is 131.7 Mg of phosphate in 1 ml. So, 1 ml in 500 ml would give you 131.7 Mg/0.5 L or about 263.4 ppm.

    If you need 10 ppm in your fishtank of 100 L this would mean adding 3.7 ml of the 263.4 ppm solution.

    Before you start adding phosphate, are you 1) seeing phosphate deficiency symptoms and 2) have you checked to make sure you have low phosphate in the water? Phosphate is principally absorbed by the roots so you can register 0 phosphate in the water column but in reality there is lots of phosphate available in the substrate for the plants.
     
  4. Greystoke
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    Greystoke Specialist

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    I still don't understand why people buy expensive Lenolax for phosphate. For the same price you can buy KILO'S of superphospate, which will last you a life time.

    Add one table spoon to 2L of water and let it stand for a few days. This will cause the Calcium Mono-Phosphate to go in solution up to a maximum (saturated) level of ≈18mg/ml.
    7mL of that solution into 100L of tank water will increase the phosphate content 1ppm.
     
  5. Puntius
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    Puntius Green fingers

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    How much is a kilo of Super phosphate bud? and where do we get it from?

    Please share your info with us :occasion14:
     
  6. Kryo
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    Kryo Green fingers

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    Thanks Tyrone!

    To answer your questions:

    My tanks N and P

    N - 10
    P - 1
    CO2 - 7bps and indicator is lime green
    Lighting - MH 8000k x2 on for 7 hours a day.

    1) no visible deficiencies on the plants but I am getting patches of spot algae on the glass and rocks. Read up on the Redfield calculations and according to my P and N ratios I need a little bit more Phos to balance out...

    2) With regards to phos being absorbed by roots, that's exactly what I thought! But from what I've read you still need a fair amount of concentration of phos in the water column too.

    I am going away on holiday next week and I don't want to come back to an algae nightmare. I will have friends on standby for any emergencies but these friends know diddly about ferts but can save my fish if necessary. My helper will be dosing the tank for me everyday and will call my friends if she sees anything amiss.

    Perhaps it would be best just to leave everything and just reduce my lighting down to 6 hours a day while I'm away...
     
  7. Greystoke
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    Greystoke Specialist

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    Don't know the current price. Bought a 5kg pack for ≈R25 some years ago. Still have ≈1kg left.
    You can buy it at nurseries.

    PS: You need to be specific about what you want. I remember that my wife went to buy it and twice she came back with something that was NOT superphosphate, but something fancy that's supposed to be high on phosphates. Probably made from chickensh*t and sawdust (forgot the make).
    That stuff doesn't work the way I described it. It MUST BE either superphosphate or triple-superphosphate
     

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