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  1. #1
    Extreme Koi Member Rank = Nisai nicke20's Avatar
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    Aug 2014
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    nexus outer chamber air recomendations

    I have my nexus 200 running but the outer chamber just doesn't bubble much at all on one side. im assuming its not quite level and having a kockney koi 50l air pump probably underpowered (air wise)
    so how big a pump? 100? 130? and is the standard airation pipe good enough or is there a better method?
    the nexus has about the max amount of media that you can put in the outer chamber
    thanks in advance

  2. #2
    Senior Member Rank = Adult Champion dbs's Avatar
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    Jul 2020
    East Norfolk
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    I had that on mime once, I lowered the water and poked all the airholes with a thin nail, they had calcified up a bit... sorted !!

    I did at alter date put a 95 lph pump on it instead too

    Sent from my SM-G998B using Tapatalk

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  4. #3
    Senior Member Rank = Supreme Champion Ajm's Avatar
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    Mar 2018
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    Heard a few people mention not using it and adding stones/cans around it.. Think it may have been freddyboy

    Sent from my F5121 using Tapatalk
    Freddyboy the legend

    "we are water keepers first"


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  6. #4
    Check the air pipe has not become unclipped, if the pipe isn’t level the lowest side will not turn over, path of least resistance rule applies. Remove the pipe and clean the calcium build up, not just round the holes, all the way round.
    Eleven year old Nexus still on original pipe, with an eleven year old EA AP95 pump, diaphragms changed twice.

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  8. #5
    Mine clogged up years ago, I now have 6 air stones running off a 130 lpm air pump. It’s a lot more flexible, you can move them around and eliminate any dead spots. It turns K1 over much more than the original jets ever did, and it’s easy to clean or replace one if they get a bit clogged.
    19,000 litres
    Nexus 320 with Dracodrum and submersible UV
    Blue Eco 320
    Eazy Pod on skimmer
    Dura+ 10kW Heat Pump
    12 koi

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  10. #6
    Hi I took Advice off this forum including from Fred and replaced the pipe with air stones.
    It turns over much better in my opinion and also stops muck from building up at the base of the bio chamber.
    Cost about £30 altogether off eBay for some 10mm pipe and 8 mm pipe. Some 10mm to 8mm t connectors and 6 off air stones.
    The only thing I would change is I would buy the EA 10mm pipe as itís more solid than regular air line and clips into the existing nexus pipe clips better to keep the pipe in place.
    Might be cheaper to just clean up the existing pipe as a first option as per other forum member responses...

    Sent from my iPhone using Tapatalk

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  12. #7
    Extreme Koi Member Rank = Kyusai Scamp's Avatar
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    Nov 2014
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    Yep half can airstones and 250 kph on my 300 for years now..good as gold. The Nexus air ring clogged quickly for me in hard water area, so took it out completely.

  13. #8
    Extreme Koi Member Rank = Nisai nicke20's Avatar
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    Aug 2014
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    Thanks for all the advice, im in a soft water area so no calcification. I bought a jeb 100 air pump, omg what a difference. The only problem was so much had settled in the outer chamber that turning on the new pump created a pond cloud machine!! anyway two days later all settled and working great

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