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  1. #1
    Extreme Koi Member Rank = Nanasai Ianb's Avatar
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    Hydrogen Peroxide for blanket weed

    Hi all
    I watched Dazle koi YouTube. Darlyl recommends HP 3% at 1 Liter per 1000 gal to kill blanket weed. He is not responding to my messages for some reason. I was wondering if I should top up with HP daily to compensate for the water the drum uses. Any idea how long it will take to kill the blanket weed
    Thanks
    Ian



  2. #2
    Senior Member Rank = Jussai g mac's Avatar
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    I would tend to stick with a tried and trusted product designed for the job.
    7500 litres
    Filtreau combi with uv.
    Some koi

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  4. #3
    Senior Member Rank = Sansai Martin59's Avatar
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    I would agree with g Mac go with, I tried and tested treatment for blanket weed. I have tried hydrogen peroxide before after watching Dazie video, I found it did work to a certain extent, knocking blanket weed back, but it returned very quickly so I ended up using blanket weed. Answer and had much better results

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  6. #4
    I would be wary of such treatment.
    Hydrogen peroxide is a very powerful oxidising agent and adding it to water which is not loaded with chemicals which you may want to "neutralise" using this oxidising effect might really irritate delicate fish tissues.
    No expert, but still advise extreme caution.
    My DIY ponds from 1988 until present day.
    All can be found here:
    https://www.ukzero.com/pond.htm

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  8. #5
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Agree with all above,that sounds like a lot of hp.
    I have used it to knock back pp and clear the pond but not at that dosage.
    John

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  10. #6
    Extreme Koi Member Rank = Nanasai Ianb's Avatar
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    Thanks guys I will hold off for now, hopefully Manky will pick up on the post and advise in further detail as to what effects. I was only taken in to consider the idea as I respect Dazzle koi as a good source of information
    Thanks Ian

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  12. #7
    There you go Ian.
    Hydrogen peroxide is an unstable chemical which decomposes rapidly when exposed to air or water. The half life of a chemical is the time it takes to decompose to half its strength and the half life of hydrogen peroxide in water is about 1 to 5 hours depending on the level of impurities in the water and, as a koi pond is full of organic material and microscopic life of all sorts, the half life in a koi pond will be at the lower end of this.

    Snatching sensible numbers out of the air, hydrogen peroxide will probably have a half life in an average koi pond of less than a couple of hours at most. That means it will be at ½ strength after 2 hours, ¼ strength after 4 hours, 1/8 after 6 hours, 1/16 after 8 hours and so on.

    So, with its rapidly diminishing strength, apart from its initial effect of knocking back blanket weed, it can't have a long lasting action to prevent it coming back.

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  14. #8
    Extreme Koi Member Rank = Nanasai Ianb's Avatar
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    Thanks Syd, that is very helpful. HP now on the shelf for neutralising PP only
    Many Thanks
    Ian

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