Welcome to Koi Forum. Is this your first visit? Register
Page 2 of 3 FirstFirst 123 LastLast
Results 21 to 40 of 46

Thread: nexus are best

  1. #21
    Extreme Koi Member Rank = Jussai RJW2012's Avatar
    Join Date
    Apr 2015
    Location
    Surrey
    Posts
    1,286
    Thanks / Likes
    1214

    nexus are best

    I don’t disagree and as I said, why I asked what they meant; EA stated it was a drum plain and simple.

    I can’t really provide any more insight than what the article states (I can’t really replicate it on the Forum either as I’ll get into trouble with Nishikigoi Yearbook; I’ll add them to the list then!)

    Rob.


    Sent from my iPhone using Tapatalk Pro
    Last edited by RJW2012; 25-06-2018 at 03:19 PM.

  2. #22
    Extreme Koi Member Rank = Nanasai blue harbour's Avatar
    Join Date
    Aug 2013
    Location
    In the town with the bent spire
    Posts
    670
    Thanks / Likes
    391
    Ok, well that really does sound like a bs skewed test then and (in terms of a standalone drum) totally unfair, unless we’re not getting the full picture somehow!??


    Sent from my iPhone using Tapatalk

  3. #23
    never intended this thread to bash nexus, imo they are good filters. The truth about e.a not changing or improving the design came out also in the conversation....when he said " we don't need to change anything, we are selling more nexus than we ever have ".....that sums up a poor attitude imo, in other words. it doesn't matter if it could be improved or not, because were selling loads so we don't care.

    The test doesnt give the size of the competitors filters, bead filters range from very small to very large, so was a very large bead filter used to compare against a very large nexus 300, or just a small bead filter ?

    How can an eazy that holds waste for days, still in the water system, be better than a drum, which removes much more waste at regular intervals !

    if you compare a drum filter linked to a bio chamber with the same amount of k1 in, as a nexus, and then do a direct performance comparison, the drum set up would walk it, and it should do , it cost 3 or 4 times more money to buy it, but cost is not the topic of conversation is it.

    David

  4. Thanks blue harbour Thanked / Liked this Post
  5. #24
    Extreme Koi Member Rank = Jussai RJW2012's Avatar
    Join Date
    Apr 2015
    Location
    Surrey
    Posts
    1,286
    Thanks / Likes
    1214
    All things aside and when you think about it, what a blinder Tony (Draco) has pulled with his drop-in...

    Rob.


    Sent from my iPhone using Tapatalk Pro

  6. Thanks blue harbour, Scamp Thanked / Liked this Post
  7. #25
    Senior Member Rank = Grand Champion voodoo_15_uk's Avatar
    Join Date
    Aug 2012
    Location
    York
    Posts
    4,526
    Thanks / Likes
    3287

    nexus are best

    I had a nexus 310 on my old pond and it worked ok but didn’t do anything for nitrate. Which readings were always off the scale.

    Since running a drum/shower/ hel x my nitrate is 3mg/l and that’s with 4 feeds a day.

    I have an easy pod on my QT which couldn’t cope with 4 small koi in 225gallons so added a shower after it with siporax which deals with the bio load fine so the pod is purely for mechanical filtration.

    Both take time to build up their biological bugs.

    The nexus could face many improvements made:
    1. Bio side outer chamber could have a flat base which slopes internally down towards the waste outlet so crap doesn’t collect in the feet holes.

    2. The waste outlets would be much better being 2”.

    3. There is a part where the inlet pipe goes up and the outer chamber is moulded around it creating a gap where media gets stuck and clogged with crap. This would be resolved by either blanking it off or using a mesh like on the outlet part.

    4. The part mentioned above with the moulding also has defects where water and muck can deep into the tiny holes around the inlet pipe so you need to seal these off to prevent a possible bacteria breeding ground.

    5. The lids are not strong enough and end up warping out of shape. An alternative material may be better.

    But they don’t want to change things.


    Sent from my iPhone using Tapatalk

  8. Thanks familyman, blue harbour, Scamp, RS2OOO Thanked / Liked this Post
  9. #26
    Extreme Koi Member Rank = Nanasai blue harbour's Avatar
    Join Date
    Aug 2013
    Location
    In the town with the bent spire
    Posts
    670
    Thanks / Likes
    391
    No backing down now Dave you trouble maker younexus are bestnexus are best

    You didn’t say anything that wasn’t valid in my book matey, they are falling behind!

    Ok there not crap filters, not compared to some of the other filters out there that dealers will happily sell you, knowing there setting you up to fail, but no way will they ever out perform a good drum/bio chamber/ shower setup, I even have my doubts they’d be up to snuff with an appropriately sized bead filter like the advantage beads from Sacramento koi tbh because once mature the bead has the advantage of much better mechanical filtration compared to the nexus.

    The only other downside really is that they can only filter the one line, so you’d need multiple filters for multiple lines/inputs.


    Sent from my iPhone using Tapatalk

  10. Thanks RJW2012 Thanked / Liked this Post
  11. #27
    Senior Member Rank = Gosai Brandlin's Avatar
    Join Date
    May 2018
    Location
    North Wales
    Posts
    272
    Thanks / Likes
    268
    I can't comment on the specifics of a nexus as I have never owned one...


    However - if the 'study' mentioned, really was by "scientists" then ask to see the laboratory method and where this was published for peer review? I read it and it doesn't read like any technical paper I have ever seen.

    Anyone can put on a white coat and shout "science" - sadly whilst often either having a dog in the race or no clue whatsoever.

  12. Thanks blue harbour Thanked / Liked this Post
  13. #28
    Extreme Koi Member Rank = Jussai RJW2012's Avatar
    Join Date
    Apr 2015
    Location
    Surrey
    Posts
    1,286
    Thanks / Likes
    1214

    nexus are best

    The article is actually about Anammox - an anaerobic ammonium oxidising bacterial process.

    Annamox allows ammonium to be oxidised by Nitrite under anoxic conditions (it requires 50% less oxygen than other nitrifies and denitrifies, and doesn’t need additional feeding (an organic carbon source).

    Eight microbiologists at the University of Nijmegen set up test ponds to see if Anammox activity could be demonstrated.

    The real benefit - the reduced build up of Nitrate whilst at the same time maintaining nitrification not possible in conventional anoxic denitrification systems.

    The Team discovered that the same moving bed filter could then perform dual roles in nitrogen reduction. The koi filter they used for their research was a Nexus.

    It then goes on to talk about the test pond.

    First interesting bit; the higher than expected nitrogen removal capacity of the Nexus filter and the K1 moving bed.

    The biofilter used 100 litres K1.

    ‘Due to the turbulence caused by air agitation, substrate transport to the biofilm is optimal and a thin biofilm is maintained which is important for optimal substrate penetration.’

    Furthermore, no nutrient or oxygen gradient is formed over the biofilter compartment which occurs in other types of filters, for example trickling filters.’

    It then goes on to talk about the nitrogen removal capacity.

    So, on average in their test, a Nexus was breaking down double the nitrogen that a trickle filter could. That’s the only mention of any other filter.

    Besides nitrite, Hydroxylamine was consumed by the biofilter. This can be an indicator of Anammox reaction and denitrification taking place.

    ‘Anammox activity has been observed in the biofilm of other filter systems, although nitrogen removal via denitrification was 7-11 fold higher in this (Nexus) biofilter.’

    Other bacteria found; Nitrosomonas, Nitrosococcus, Nitrospira and Planctomycetes app. (Note the presence of Nitrobacter in nitrification has long since been debunked - their comment not mine.)

    The Team also commented on the presence of multiple, different ammonium oxidising bacteria, when usually a single genus or species dominates.

    Goes on to say; you can’t culture Anammox - it was present in the static K1 bed of the Nexus too.

    You then have the table mentioned in the previous post.

    The point up to here then; static and moving bed provides the optimal setup.

    It then goes on to talk about the importance of bacteria, biofilms and other life forms - as we know.

    ‘As far as we know, this is the first freshwater aquaculture system in which Anammox is demonstrated.’

    Sums up; nearly two decades on, the work that a healthy robust biofilm on a moving bed of K1 can do, still continues to surprise and educate.

    It mentions nothing about the other filters tested, again just the table alluded mentioned earlier.

    The test pond was 25,000 litres with 80 koi.

    Those are the salient points.

    EA have quoted it a number of times, posting a picture of the article, etc. If there is a problem then please remove the Post.

    Rob.



    Sent from my iPhone using Tapatalk Pro
    Last edited by RJW2012; 25-06-2018 at 07:28 PM.

  14. Thanks blue harbour Thanked / Liked this Post
  15. #29
    Extreme Koi Member Rank = Yonsai muttley's Avatar
    Join Date
    Aug 2011
    Posts
    213
    Thanks / Likes
    35
    Fluidized oolitic sand filters have massive biological filtration capabilities. Far exceeding what ANY nexus owner could even dream of. Have run them for years.

  16. Thanks RJW2012 Thanked / Liked this Post
  17. #30
    Extreme Koi Member Rank = Jussai RJW2012's Avatar
    Join Date
    Apr 2015
    Location
    Surrey
    Posts
    1,286
    Thanks / Likes
    1214

    nexus are best

    Quote Originally Posted by Brandlin View Post
    I can't comment on the specifics of a nexus as I have never owned one...


    However - if the 'study' mentioned, really was by "scientists" then ask to see the laboratory method and where this was published for peer review? I read it and it doesn't read like any technical paper I have ever seen.

    Anyone can put on a white coat and shout "science" - sadly whilst often either having a dog in the race or no clue whatsoever.
    The paper details are posted above, in the photo.

    Rob.


    Sent from my iPhone using Tapatalk Pro

  18. Thanks andikoi Thanked / Liked this Post
  19. #31
    Extreme Koi Member Rank = Kyusai Scamp's Avatar
    Join Date
    Nov 2014
    Posts
    1,087
    Thanks / Likes
    1192
    I agree with a lot of the posted comments. I have a 310 Nexus, and a pod on the skimmer line. The Nexus at the time, ( 6years ago) was great for me, small footprint and relatively easy to clean compared with others, and good bio for Nh3 and No2..But it blocks easily ( good sign it removes cr,p) and the cleaning every two days was a pain. The drop in Draco is a perfect, easy and immediately beneficial upgrade. Now it’s vastly better. I still believe the Nexus is a great first time proper Koi filter, which ticks a lot of boxes in terms of bio capacity and mech filtration, and I would still recommend a second hand one to those on a budget..But times have moved on and 6 years is a long time in tech. terms. Drums are great, and benefits clear to most of us. What the salesman claimed to FM at the show is self interest protectionist nonsense...

    We all know that Nexus will be happy to bang out those mouldings for as long as possible and milk the cow, before having to change design and associated tool costs. What was amazing was the automated solution they introduced, to me it was a poor attempt at automating - whilst not updating the eazy itself...an integrated drum would have been a winner, as Draco have discovered..

  20. Thanks RJW2012, blue harbour, andikoi Thanked / Liked this Post
  21. #32
    Extreme Koi Member Rank = Jussai RJW2012's Avatar
    Join Date
    Apr 2015
    Location
    Surrey
    Posts
    1,286
    Thanks / Likes
    1214
    Quote Originally Posted by muttley View Post
    Fluidized oolitic sand filters have massive biological filtration capabilities. Far exceeding what ANY nexus owner could even dream of. Have run them for years.
    Whilst looking for further details on the scientific paper, the use of sand filters in aquaculture cropped up a lot.

    Rob.


    Sent from my iPhone using Tapatalk Pro

  22. Thanks andikoi Thanked / Liked this Post
  23. #33
    Quote Originally Posted by RJW2012 View Post
    All things aside and when you think about it, what a blinder Tony (Draco) has pulled with his drop-in...

    Rob.


    Sent from my iPhone using Tapatalk Pro
    Story I’ve been told from a few Koi outlets, Tony went to EA with his Draco and they weren’t interested, that’s some serious amount of egg on face, what did EA come up with, Nexus Automatic System, even more egg on face.

  24. Thanks blue harbour, RJW2012, andikoi, Scamp Thanked / Liked this Post
  25. #34
    Extreme Koi Member Rank = Yonsai muttley's Avatar
    Join Date
    Aug 2011
    Posts
    213
    Thanks / Likes
    35
    K1 surface area is 800m2 per m3.
    Oolitic sand is 10,000m2 per m3.
    Put that in your pipe Mr plastic media.
    A correctly setup fluid bed sand filter will outperform a Nexus with ease.

  26. Thanks andikoi, RJW2012 Thanked / Liked this Post
  27. #35
    Senior Member Rank = Grand Champion andikoi's Avatar
    Join Date
    Aug 2013
    Location
    wakefield,west yorkshire
    Posts
    3,491
    Thanks / Likes
    3764
    Strange thing is ea had the ideal thing but decided to shelf it.The answer. The biggest mistake they made by not keeping R&D looking into improving it.andi

  28. Thanks RJW2012, Scamp Thanked / Liked this Post
  29. #36
    Extreme Koi Member Rank = Jussai RJW2012's Avatar
    Join Date
    Apr 2015
    Location
    Surrey
    Posts
    1,286
    Thanks / Likes
    1214
    Quote Originally Posted by Doitsusanke View Post
    Story I’ve been told from a few Koi outlets, Tony went to EA with his Draco and they weren’t interested, that’s some serious amount of egg on face, what did EA come up with, Nexus Automatic System, even more egg on face.
    That’s why they are so tetchy!!!

    Rob.


    Sent from my iPhone using Tapatalk Pro

  30. Thanks blue harbour Thanked / Liked this Post
  31. #37
    Extreme Koi Member Rank = Yonsai muttley's Avatar
    Join Date
    Aug 2011
    Posts
    213
    Thanks / Likes
    35
    100% falling behind the times and in my opinion they must think we are stupid to think that ANY plastic media in ANY situation can provide a level of de-nitrification that would be of benefit considering the nitrate factories that plastic media filters are.

  32. #38
    Quote Originally Posted by familyman View Post
    the filter bugs need all the fines to feed on
    Wow you learn something everyday. There's me for the last 25 years thinking that the food for my bio filter bacteria was ammonia and nitrites. I'll start feeding them algae from now on

  33. Thanks blue harbour Thanked / Liked this Post
  34. #39
    Extreme Koi Member Rank = Yonsai muttley's Avatar
    Join Date
    Aug 2011
    Posts
    213
    Thanks / Likes
    35
    Quote Originally Posted by Pinnacle View Post
    Wow you learn something everyday. There's me for the last 25 years thinking that the food for my bio filter bacteria was ammonia and nitrites. I'll start feeding them algae from now on
    I would love EA back that statement up lol. First off it's "A nexus beats a drum for fines removal" now " Filter bugs need fines to feed on".
    Make your mind up EA you're becoming a joke.

  35. Thanks blue harbour Thanked / Liked this Post
  36. #40
    Quote Originally Posted by muttley View Post
    I would love EA back that statement up lol. First off it's "A nexus beats a drum for fines removal" now " Filter bugs need fines to feed on".
    Make your mind up EA you're becoming a joke.
    That's the issue with big companies. If they don't train the sales reps correctly, then Sales reps will fill in the gaps they don't know with waffle.
    This sales rep was obviously under educated.

 

 
Page 2 of 3 FirstFirst 123 LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT +1. The time now is 05:57 AM. Online Koi Mag Forum
Powered by vBulletin® Version 4.2.3
Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.

vBulletin Improved By vBFoster® (Lite Version), © UltimateScheme, Ltd.