PMDD
(Poor Man’s Dupla Drops)

A plant fertiliser recipe originally devised to provide a low cost alternative to a commercial fertiliser.
When the original recipe was created in the 80’s it was wrongly assumed that Phosphate and Nitrate were the causes of algae and should be limited, this was later proved wrong and the PMDD+P recipe was designed to acknowledge this.

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5 Comments
  • Dave Wilson
    Posted at 21:06h, 03 September Reply

    Hello, some of your links seem to be broken. (PMDD + P, I cant get to this page.)

    Cheers
    Dave

    • Nigel
      Posted at 07:35h, 04 September Reply

      Hi Dave, it works for me. What browser are you using?

  • Dave Wilson
    Posted at 07:29h, 14 October Reply

    Tried a differnt browser, works now, thanks for the suggestion.

  • Alessio Spunton
    Posted at 20:27h, 16 October Reply

    Hello. With this formula:

    – how can I add phosphate?
    – How Much water I can change?

    Thx ! King regards

    • Nigel
      Posted at 07:52h, 17 October Reply

      Hi Alessio, use the PMDD+P version on this page.
      You can change as much water as you like. The amount of water you ‘can’ change with any dosing routine isn’t a function of the routine itself.
      More a function of the amount of growth we expect to encounter given the nutrients, CO2, light etc.
      For instance with Estimative index, we generally have high light, high CO2, no limiting of nutrients and so expect to encounter fast plant growth – the easiest way
      to reduce buildup of plant metabolites (Carbohydrates etc) is to do a 50% water change.

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