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  1. #1

    Debris buildup after treatment for blanket weed.

    Hi,Iím new to the group but wondered if you could advise me on a reoccurring problem I seem to have. Annually around April I treat my koi pond with cloverleaf for blanket weed.I always make sure I do this before it starts to build up & make sure there is little debris present.Although it seems to stop the blanket weed I seem to get a persistent build up of black debris that blocks the filters quickly for several months afterward, am I doing something wrong?



  2. #2
    would that not be dead blanket weed?

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  4. #3
    Quote Originally Posted by Mitsufishi View Post
    would that not be dead blanket weed?
    Not sure, had nothing resembling blanket weed for about 2 months just this persistent thin black covering on the liner.

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  6. #4
    Senior Member Rank = Mature Champion Ajm's Avatar
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    Think fred had black algae that he had to jet wash off his pond think trace helped him out I could be wrong but worth an ask . If I remember black algae is harmful but I dont know enough to say that's what you have by any means

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    Johnathan

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  8. #5
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Showa67 View Post
    Hi,I’m new to the group but wondered if you could advise me on a reoccurring problem I seem to have. Annually around April I treat my koi pond with cloverleaf for blanket weed.I always make sure I do this before it starts to build up & make sure there is little debris present.Although it seems to stop the blanket weed I seem to get a persistent build up of black debris that blocks the filters quickly for several months afterward, am I doing something wrong?
    hi mate I have stopped using Clover blanket weed now. I had that issue. like a oily black slime. not what AJ is on about black blanket weed. that s another story.
    so I now use Aqua resolve. and I have not had the black slime since.
    fred

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  10. #6
    Senior Member Rank = Nanasai Tom Koi's Avatar
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    Quote Originally Posted by freddyboy View Post
    hi mate I have stopped using Clover blanket weed now. I had that issue. like a oily black slime. not what AJ is on about black blanket weed. that s another story.
    so I now use Aqua resolve. and I have not had the black slime since.
    fred
    How often do you treat and how much do you use Fred?

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  12. #7
    Thank you , i will give the aqua resolve a try next time.

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  14. #8
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Tom Koi View Post
    How often do you treat and how much do you use Fred?
    Hi tom i treat half dose of my pond
    Every end of spring. And if real bad.
    Like last year.
    Then again about end of august.
    I never let it go beyond the fuzz stage.
    This year i had half a tub of clover leaf. Left over. So put that in.
    And ended up with the black oily slime mate.

    Sent from my SM-G925F using Tapatalk

  15. #9
    Clover Leaf blanket answer is nasty stuff, I used it a few years back and it was far too aggressive. Last couple of years if required I have used blanket weed resolve - much better stuff I think. First time I used it it turned the water cloudy for a day or two then cleared, next time I used it the water stayed clear same as other times I used it and that was all at full strength.

    From memory the frequency is once every 10 days for a month then once a month to keep on top of it. I found it cleared the blanket weed on the first or second dose and was advised to stop if it had cleared the blanket weed. I never needed the follow up monthly doses and the following year just one dose done the trick for me

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  17. #10
    Senior Member Rank = Nanasai Tom Koi's Avatar
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    Quote Originally Posted by freddyboy View Post
    Hi tom i treat half dose of my pond
    Every end of spring. And if real bad.
    Like last year.
    Then again about end of august.
    I never let it go beyond the fuzz stage.
    This year i had half a tub of clover leaf. Left over. So put that in.
    And ended up with the black oily slime mate.

    Sent from my SM-G925F using Tapatalk
    Oh , the more I hear about living with Koi and their ponds

    Latest I've heard is the time plastic media like K1 takes to mature, I feel like screaming

    Had some sleepless nights over this pond and its not even flipping started yet!!!
    Last edited by Tom Koi; 21-06-2019 at 09:31 PM.

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  19. #11
    Senior Member Rank = Rokusai Handy Kenny's Avatar
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    Showa67,

    I use Supertab and dose regularly to keep the bacterial presure down in the water. I use it all through the year upping the dose in Spring/early summer. Since I have started using it I have not had blanket weed and the growth on the pond walls is minimal. Got mine from Blackburn House Koi.

    Kenny

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  21. #12
    Peculiar this problem!,i use CBA & get no problems at all.Looking on the net,most posts seem to point towards a build up of sludge on the bottom,lack of aeration & inadequte filtration.We have a 2,500 gallon pond with an Oase Profidrum filter,12,000 LPH pump,two airstones & a 55w UV.The slme appears to be a build up of bacteria.Perhaps a pond clean or vacuuming to bottom may help.
    Ray.

  22. #13
    Senior Member Rank = Nanasai Tom Koi's Avatar
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    Quote Originally Posted by Handy Kenny View Post
    Showa67,

    I use Supertab and dose regularly to keep the bacterial presure down in the water. I use it all through the year upping the dose in Spring/early summer. Since I have started using it I have not had blanket weed and the growth on the pond walls is minimal. Got mine from Blackburn House Koi.

    Kenny
    Is your pond covered at all or open to the elements, when I say covered I mean a Pergola or similar?

    Thanks

    PS same question to Matsuba?

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  24. #14
    Quote Originally Posted by Tom Koi View Post
    Is your pond covered at all or open to the elements, when I say covered I mean a Pergola or similar?

    Thanks

    PS same question to Matsuba?
    No,it`s in full sunlight for part of the day.

    Ray.

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