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Iron Sulphate Stains on Concrete!

robin 435robin 435 Posts: 54
in Problem solving
Hello

I put some feed & weed on my lawn earlier this season but some of it got on my paths, and now I have orange stains on the concrete from the Iron Sulphate moss killer. I will be careful not to do that again!

I've tried cleaning them with a power washer, but it made no difference. The stains must have soaked in. Can you recommend a treatment to remove the stains please?

Thanks
Robin



Posts

  • bédébédé Posts: 3,095
    edited August 2023
    Citric acid solution.  Watered on and left.  A strong acid, but it is food grade.  Read the instructions.

    NB.  When I use Ferrous sulphate I always do it, predissoved, separately from the fertiliser application..
     location: Surrey Hills, England, ex-woodland acidic sand.
    "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
  • Pete.8Pete.8 Posts: 11,340
    I used to get the same on old concrete paving, but since getting a dog I haven't used it.
    The stains do wash away with rain after a couple of months. I used to use it every year and get the stains every year, but never bothered to try and shift them knowing they would go of their own accord.
    Didn't know about the citric acid treatment, probably works faster than rain.

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
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