How to make DIY TPN+?

Discussion in 'Aquarium Fert Dosing' started by aaronnorth, 19 Sep 2008.

  1. aaronnorth

    aaronnorth Member

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    48g Potassium Nitrate
    2.2g Potassium Phosphate (monobasic)
    17g Magnesium Sulphate Heptahydrate (Epsom Salts)
    5g Aqua Essentials Trace Elements Mix
    0.4g E300 Ascorbic Acid
    0.2g E202 Potassium Sorbate
    500ml distilled water

    so i get the above to make it, but do i have to have distilled water?

    and do i mix the whole lot in at once?
     
  2. ceg4048

    ceg4048 Expert/Global Moderator Staff Member

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  3. aaronnorth

    aaronnorth Member

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    thats where i got the info from, but it doesn say if i have to use distilled water, or whether i can use tap water?
     
  4. ceg4048

    ceg4048 Expert/Global Moderator Staff Member

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    Paragraph 2 of How Do I Make It States:

    Code:
    As an example here is a formulation that could be used:
    
    17g  Potassium Nitrate
    3.5g  Potassium Phosphate (monobasic)
    3.5g  Potassium Sulphate
    8.0g  Magnesium Sulphate Heptahydrate (Epsom Salts)
    6g  Aqua Essentials Trace Elements Mix
    0.5g  E300 Ascorbic Acid
    0.2g  E202 Potassium Sorbate
    500ml distilled water
    Cheers,
     
  5. Egmel

    Egmel Member

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    I make it in batches of 1.5l and I don't use distilled water. I filter and boil the water first though (don't forget to allow it to cool otherwise if you're mixing in a pop bottle it can get messy!).

    Seems to last in the bottom of my cupboard happily enough with no settling or things growing in it. Fish are all fine, though I think my shrimps and snails have had enough of me overdosing the tank recently so am going back to normal dosing levels!
     
  6. jay

    jay Member

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    Right so I can get this from AE:
    10g Potassium Nitrate
    1.0g Potassium Phosphate (monobasic)
    4.0g Potassium Sulphate
    and obviously their trace elements mix.

    I can get distilled water no problem. And I'm guessing that epsom salts are the same as what you get from the chemist.

    But where do I get:
    0.5g E300 Ascorbic Acid
    0.2g E202 Potassium Sorbate

    ??
     
  7. JamesC

    JamesC Member

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  8. jay

    jay Member

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    mmmmm... brew. :)

    Cheers fella.
     
  9. jay

    jay Member

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  10. JamesC

    JamesC Member

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    That's the stuff. Have you looked on ebay as you can normally get it cheaper if it's available.

    James
     
  11. jay

    jay Member

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    I'll have a look :)
     
  12. jay

    jay Member

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    Right, I'm not really up for mixing enough just for 250-500ml.
    Anyone had any experience mixing up litres of this stuff? does it keep?
     
  13. aaronnorth

    aaronnorth Member

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    you can keep it in the fridge to help, and dont keep it in sunlight either.
     
  14. Egmel

    Egmel Member

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    I make 1.5l batches and dose about 10-15ml a day, seems to keep fine in the cupboard under my tank until it runs out.
     
  15. JamesC

    JamesC Member

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    I kept a bottle in the cupboard for six months and it seemed fine. It probably is better to use it quicker than that as I have no real way of knowing what reactions are taking place in the bottle. When iron reacts with phosphate an insoluble precipitate is formed. As long as you don't see this then you can presume that then iron is still locked up in the chelator.

    James
     
  16. Egmel

    Egmel Member

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    That's basically what I check for, if there's anything floating or sinking in it!
     
  17. jay

    jay Member

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    Didn't want to start a new thread, so I'll carry on in this one seeing as its the same subject.
    I'm about to start measuring up to make my own TPN+ and I'm just wondering what the epsom salts are for?
     
  18. ceg4048

    ceg4048 Expert/Global Moderator Staff Member

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    Hi,
    Epsom Salts=MgSO4

    Cheers,
     
  19. jay

    jay Member

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    Ok then. Thanks.

    Thinking I'm just going to make up a 500ml batch at a time. Was hoping to make larger amounts, but all the talk of iron insolubles forming. Sure doing a new batch every couple months won't be any great shakes.
     
  20. aaronnorth

    aaronnorth Member

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    the ascobic acid should prevent the insoluable iron forming.
     

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