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Phosphate dosing

Discussion in 'CO2 Enrichment' started by laka, May 1, 2007.

  1. laka

    laka Prolific Poster

    Jan 21, 2007
    Likes Received:
    Local Time:
    5:19 PM
    I have 501 litres of water in my tank ie 130 US gallons approx.
    EI dosing suggests 1.5 teaspoons in total weekly of to achieve 1-2ppm PO4.
    I have KH2PO4. When i plug these figures in Fertilator i get 11.7ppm as PO4!!
    Who is correct?
  2. Tom Barr

    Tom Barr Founder
    Staff Member Administrator

    Jan 23, 2005
    Likes Received:
    Local Time:
    5:19 PM
    That is total, not per dose.
    Divide that into 3 and you get about 3-4 ppm per dose
    You do not need that much, 6-7ppm per week is plenty.

    So divide a teaspoon into 3 parts.
    That should be enough per dose.

    1/3 tsp 3x a week

    EI does not suggest a target 1-2ppm based on that amount, the 1-2ppm is a min amount, not a max amount that's maintained under heavy growth/uptake etc

    The actual dose that is really suggested is about .4 of teaspoon per dose or about 1.2 tsp over an entire week.
    About 9 ppm per week or 3 ppm per dosing, 1 ppm or so is removed pretty quick, then leaves you with about 2ppm or more for the week.

    I think most are fine with less..............but adding that much does no harm either.........

    Tom Barr

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