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  1. #1

    Virkon Aquatic powder questions

    Looks like I've got a koi with a knock on its tail, just realised today and I was vaccing the bottom yesterday so no doubt released potential nasties, so thought I'd try some Virkon Aquatic I bought last year off here, before any other drastic action.

    1) What is the actual dosage, I've seen differing opinions from 5g for 1000G to 5g for 500G even saw 2-4g for 220G.

    2) UV off for 24 hours or longer?

    3) feed or not?

    Cheers

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  2. #2
    Senior Member Rank = Grand Champion samp09's Avatar
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    I dose at 5g per 1000g, 10g per 1000g for a double hit. It is recommended to start with a double dose so 10g per 1000g then drop to 5g weekly when used frequently

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  4. #3
    Nice one, keep UV off for any time?

    I ended up doing 10gram per 1k Gallon & turned UV off at the moment, I split the amount over 6 buckets over a 6 hour period.

    Fish don't seem bothered by it at all, only issue is a bit of froth on the surface at the moment.



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    Senior Member Rank = Grand Champion davethefish1's Avatar
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    dosage also depends on water hardness, less for soft water.
    costal koi used to have a .pdf for virkon use in the pond but it has gone since thier new web site...

    https://coastal-koi.com/other_files/28_Virkon_Aquatic_Information.pdf

    here is another one....
    https://www.koicarp.org.uk/medicatio...Virkon_Aquatic

    but use in a pond is 'off label' afaik... as it is sold as a disinfectant...
    the dosages quoted in the links seem quite high to me.

    i've used it before at nearly the same dosage as samp 20g (four tablets) at Kh3 to 11.500 litres.
    then 10g (two tablets once a month after) just remember if trying higher doses to do water changes in between.
    Last edited by davethefish1; 29-06-2022 at 11:29 PM.

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    Senior Member Rank = Grand Champion samp09's Avatar
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    Yeah I left my UV off although I have it off a lot anyway, I can't remember if it is supposed to go off. The tablet form is 1 tablet per 1000g on the bottle as well for a standard dose, 2 per 1000g for the first dose again.

    The froth will go after a day or two, to be honest I just mix it in a bucket and add it to a return all at once, probably not the best way of doing it but I like the idea of it spreading around the pond at the full dose before hitting the filter

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