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Thread: UV Position

  1. #1

    UV Position

    Iím upgrading my Uv and Iím reading different opinions on wether to position before or after the filter...

    Currently Iíve got it before the filter, the last few years itís kept the water clear but this year itís nowhere as near as clear as normal, everything seams to be working well etc.

    Thanks

    Also any recommendations on which sort? Currently looking the the aqua evolution range

    Scott


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  2. #2
    Where are users uv position at the moment and do you ever suffer from green water threw out the year?


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  3. #3
    Extreme Koi Member Rank = Kyusai Scamp's Avatar
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    Quote Originally Posted by Scottybee View Post
    I’m upgrading my Uv and I’m reading different opinions on wether to position before or after the filter...

    Currently I’ve got it before the filter, the last few years it’s kept the water clear but this year it’s nowhere as near as clear as normal, everything seams to be working well etc.

    Thanks

    Also any recommendations on which sort? Currently looking the the aqua evolution range

    Scott


    Sent from my iPhone using Tapatalk
    Hi, my UV is after the filter, so clean water passes through it, cheers

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  5. #4
    Extreme Koi Member Rank = Gosai NickK-UK's Avatar
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    Quote Originally Posted by Scamp View Post
    Hi, my UV is after the filter, so clean water passes through it, cheers
    I always wonder why people treat waste that they are going to remove, the suspended dirt reduces the efficiency of the UV so bacteria will get into the filter anyway plus you're putting a constriction on the flow rate. Also I hear the line "UVC causes the algae/bacteria to clump together" well considering the UV light causes the death of the cell but not immediately.. it's either likely to be in your filter waste by normal filtration or back in the pond before it dies. Depending on the flow rate.

    After the filter - this is the water returning to the pond thus should be treated, the UVC isn't fighting against waste so, in theory, higher efficiency and anything left before it gets to the pond (from pond or filter) is irradiated before it's return. A higher return flow rate can be achieved by bypassing if need be. A UVC isn't 100% effective so you will have algae/bacteria returned to the pond ready to pass through again.

    I would place in the return sump.

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  7. #5
    Senior Member Rank = Nanasai Rapleyr's Avatar
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    I am looking to change my 55 watt UV inline after filters to an amalgam 55 watt placed into the bottom drain pipe before my filters. Hopefully I see an improvement


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  8. #6
    Quote Originally Posted by Rapleyr View Post
    I am looking to change my 55 watt UV inline after filters to an amalgam 55 watt placed into the bottom drain pipe before my filters. Hopefully I see an improvement


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    Are you sure the pipe is UV stable? If not it will make it brittle and any movement will cause the pipe to fracture.
    Last edited by DiabloDave; 22-05-2020 at 02:56 PM.

 

 

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