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Thread: Amalgam UV

  1. #1
    Junior Member Rank = Fry JamesT's Avatar
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    Amalgam UV

    Good Evening and Happy Christmas


    First post here so go easy on me please!


    I run a profi combi bio 50 on a 7k gallon pond which has been up and running since mid August this year. I currently have 15 koi, heated and having spent the last 4 months trying to get the bio cycle going I am relieved to have finally cracked it so have been steadily increasing the feed on an auto feeder.


    I have an amalgam UV installed in the drum section but as I’ve been maturing my bio side it’s been switched off until yesterday, went out last night to put them to bed and do my checks and noticed I could see the UV glow from within the bio chamber. So knowing enough about UV I know it kills bacteria good and bad etc so suddenly thought is the UV now killing/reducing the beneficial bacteria on the very media I have spent the last 4 months nurturing?


    This question must apply to most people running a combined drum and bio I assume!?


    Any answers/help/suggestions much appreciated!



  2. #2
    Senior Member Rank = Supreme Champion Ajm's Avatar
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    Can't comment on the uv mate. But I know 4 months has been trying and hard but please keep watching like a hawk from experience a fully mature pond bio film and mature media to be firing on all cylinders can take up to and beyond 18 months to be rid of the dreaded NPS .

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    Freddyboy the legend

    "we are water keepers first"

    Johnathan

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    Junior Member Rank = Fry JamesT's Avatar
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    Hi Johnathan

    Yes I know, I am testing every other day and have my eye on it, the feeder is putting a consistent amount of food in so the loading is smooth, if I see a rise in Ammonia I just reduce the feed duration slightly and it catches up. I'm currently heated to 18deg C so doing all i can to minimise fluctuations, I think....

    Thanks for your reply

    James

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    Moderator Rank = Supreme Champion Feline's Avatar
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    To denature cells the UV needs to be fairly near the water that’s flowing, so unless the slots of your bio section put the media in direct line of ‘sight’ of the UV bulb it’s unlikely it would be nuking your biofilm. But biofilm bacteria do prefer to grow in the dark, so having a glow in their section is probably not ideal.

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    Junior Member Rank = Fry JamesT's Avatar
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    Thanks Feline

    My tube runs parallel to my bio chamber and is at the same height as the slots so the media does have line of sight of the bulb (through the slots)!!! I turned it back on again yesterday, just tested the water and ammonia is up very slightly to 0.03 from 0 (tested yesterday) testing on a Hanna Aquaculture Photometer so although far from scientific you could assume its had a negative impact on my bio side.... I have just turned it off again, in the spring I will cut another hole and lower it so taking it out of sight of the bio chamber but there will still be a glow visible. There's always something to do in the world of koi!

    Happy New Year!

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