mould on my ei mix

Discussion in 'Aquarium Fert Dosing' started by fourmations, 8 Jul 2009.

  1. fourmations

    fourmations Member

    Messages:
    201
    hi all

    i have made up my npk mixes with tapwater in the past
    but have used RO on the last batch

    it seems to be forming a mould?
    there is white fuzzy lumps in the mix

    any thoughts?

    rgds

    4
     
  2. ceg4048

    ceg4048 Expert/Global Moderator Staff Member

    Messages:
    8,953
    Location:
    Chicago, USA
    Difficult to draw any correlation unless you had mixed an equivalent mix at the same time using tap and kept them in the same location as a control. The mould could have been due to higher ambient temperatures for example. Having said that, tap might be chlorinated which is a deterrent for a while. You could try adding a few drops of strong acid to your mix and/or keeping it in the fridge to deter mould/bacteria.

    Cheers,
     
  3. fourmations

    fourmations Member

    Messages:
    201
    thanks ceg

    my mix is kept in the cabinet with my external and co2
    so it is probably too warm

    i read since that you suggest tap water is fine
    so thats handier, i have to drive 10 miles to get RO
    and i dont use it much

    regards
     
  4. JamesC

    JamesC Member

    Messages:
    1,276
    Location:
    Bexley, Kent
    A few drops of Normal Hydrochloric Acid normally does the tricks but failing that you can use a food grade mould inhibitor called E202 Potassium Sorbate obtainable from here - http://www.the-home-brew-shop.co.uk/. Add 0.2g per 500ml of solution.

    James
     
  5. Dan Crawford

    Dan Crawford Founder Staff Member

    Messages:
    3,268
    Location:
    Daventry, Northants
    I've had mould on my Easy like Fero, Fospho and Nitro, any thoughts?
     
  6. JamesC

    JamesC Member

    Messages:
    1,276
    Location:
    Bexley, Kent
    You shouldn't get mould with a commercial product. I would presume they put a mould inhibitor in. Normally in Europe they use methyl parabens but there's been loads of talk about possible health risks which are totally unfounded, but thats another story. Keep it cold and dark once opened or add a bit of potassium sorbate. Potassium sorbate does work best at around a pH of 6 so if your solution is >pH 7 it may not be too affective. I've waffled a bit, maybe just add a bit of hydrochloic acid and see if that works.

    James
     
  7. Dan Crawford

    Dan Crawford Founder Staff Member

    Messages:
    3,268
    Location:
    Daventry, Northants
    Cheers mate, it's just been sat in the cabinet for about 6 months or so coz i don't use it.
     

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