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  1. #1
    Senior Member Rank = Yonsai Mode's Avatar
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    Green Water - Drum the answer?

    Hello All

    So pond has been running for about 9-10 weeks and water parameters are OK although I know it takes months to get filters mature!

    My issue is that the water is still green which i want to sort out. it is "less green" since changing the UV tubes in the two Evo 75's.

    So, is the issue that i need more mechanical filtration - would a standalone drum be a good option for this? (I figure my nexus and 5 bay is enough for bio filtration?)

    Thoughts?

    Cheers!

    mode


    10,118Gal 46,000l
    Nexus320
    Cloverleaf GenesisII(5 bay)
    2x13,000lph pumps, 2xEvoAqua75wUV
    11 Koi

  2. #2
    Moderator Rank = Supreme Champion Feline's Avatar
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    The question is:
    is your water green with algae or green with fines?
    Put some in a glass and allow it to settle for a few hours. If it stays green then its algae and you need more UV oomph or more shade for the pond.
    If it settled out then it's fine particles which Nexus filters are not great at removing. If that is the case a drum will really help.

    You could address both by getting a drum with a submersible UV inside it- they are much more powerful than the same wattage of in-line UV units.
    The Amalgam UV does a very good job on my 6000 gallon pond in full sun, with an 80w unit.
    Your pond might need 2 of them though, depending how much shade you have.

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  4. #3
    Senior Member Rank = Yonsai Mode's Avatar
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    Quote Originally Posted by Feline View Post
    Put some in a glass and allow it to settle for a few hours. If it stays green then its algae and you need more UV oomph or more shade for the pond.
    Pint of water will be sitting in my kitchen overnight - will let you know what happens!

    I have two 75 UV and I actually have a 3rd which I could install - does it really need all that UV?

    Cheers!

    Mode
    10,118Gal 46,000l
    Nexus320
    Cloverleaf GenesisII(5 bay)
    2x13,000lph pumps, 2xEvoAqua75wUV
    11 Koi

  5. #4
    As previously advised, new UV tubes are good for about six months, ie through summer, providing your time (dwell) passing through the UV is not too rapid? Shade over the pond or Sun all day, all variables to deal with!

    The absolute minimum (often quoted) is 10 Watts/1,000 gallons, much more is better! Dependant on your variables?
    Best of luck


    Sent from my iPad using Tapatalk

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  7. #5
    Senior Member Rank = Yonsai Mode's Avatar
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    Tubes are brand new - 150w total.

    Flow is not that fast through them.

    Will see what the pint glass shows me in the morning!


    Sent from my iPhone using Tapatalk Pro
    10,118Gal 46,000l
    Nexus320
    Cloverleaf GenesisII(5 bay)
    2x13,000lph pumps, 2xEvoAqua75wUV
    11 Koi

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  9. #6
    Extreme Koi Member Rank = Nanasai Fishplanetkoi's Avatar
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    Be sure that the quartz tubes are clear of limescale or any other coating that will defuse the uv light. Being in a hard water area I have to soak mine in kettle de-scaler every year to clean them of the limescale. Just a thought.

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  11. #7
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    55 watt UV, Nexus flowing at just 4000 lph, and this is what I got out of the CLEAN side of the nexus in just 2 hours tonight:

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  13. #8
    Senior Member Rank = Yonsai Mode's Avatar
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    Morning All

    Pint glass test done and there was a fine layer of green (very small amount) but enough to convince me this is a mechanical filtration issue.

    Need to save the pennies for a Drum eventually but in the meantime..... any ideas?

    Mode
    10,118Gal 46,000l
    Nexus320
    Cloverleaf GenesisII(5 bay)
    2x13,000lph pumps, 2xEvoAqua75wUV
    11 Koi

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  15. #9
    Moderator Rank = Supreme Champion Feline's Avatar
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    Some people have done mods to their Nexus such as using filter socks or filter wool in the exit, but because these things block up so quick it doesn't seem to be that good a permanent solution. Also if pump fed can cause overflow problems or if gravity fed end up starving the pump.

    Have you got the micro K1 thingy in your Nexus mech section?

  16. #10
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    Quote Originally Posted by Mode View Post
    Morning All

    Pint glass test done and there was a fine layer of green (very small amount) but enough to convince me this is a mechanical filtration issue.

    Need to save the pennies for a Drum eventually but in the meantime..... any ideas?

    Mode
    Even EA themselves have no idea based on my recent emails from them which are posted on another thread.

    They will tell you you're cleaning the Nexus too frequently; you are not giving the eazy a chance to build up a strong biofilm; your pump flow is too fast; you're not doing enough partial water changes etc etc.

    It will be your fault not the Nexus' fault.

    In reality I think a drum is the realistic answer at least in my case.



    Sent from my Pixel 2 using Tapatalk

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  18. #11
    Moderator Rank = Supreme Champion Feline's Avatar
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    I think when you look at a bunch of K1 all crushed together in a stationary stack, it just doesn't make sense that it would be able to trap fine particles, it has holes in it

    A lot of us here have had struggles with EazyPods and Nexi in this way to be honest. They really should have invested in the Draco as a product enhancement IMO rather than going in for all the automatic gadgetry they have added to it instead.

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  20. #12
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    Doesn't matter what option they go for Feline, the bit that grates me is the promise of crystal clear healthy water.

    That part of it is an outright lie when aligned with the product's turnover/koi pond size specs.

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