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Thread: nexus are best
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25-06-2018, 03:17 PM #21
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 ProLast edited by RJW2012; 25-06-2018 at 03:19 PM.
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25-06-2018, 03:42 PM #22
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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!??
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25-06-2018, 04:16 PM #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
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25-06-2018, 04:37 PM #24
All things aside and when you think about it, what a blinder Tony (Draco) has pulled with his drop-in...
Rob.
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25-06-2018, 04:47 PM #25
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.
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25-06-2018, 06:51 PM #26
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No backing down now Dave you trouble maker you
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.
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25-06-2018, 07:11 PM #27
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.
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25-06-2018, 07:19 PM #28
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 ProLast edited by RJW2012; 25-06-2018 at 07:28 PM.
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25-06-2018, 07:20 PM #29
Fluidized oolitic sand filters have massive biological filtration capabilities. Far exceeding what ANY nexus owner could even dream of. Have run them for years.
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25-06-2018, 07:21 PM #30
nexus are best
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25-06-2018, 07:24 PM #31
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..
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25-06-2018, 07:24 PM #32
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25-06-2018, 07:39 PM #33
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25-06-2018, 07:44 PM #34
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.
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25-06-2018, 07:44 PM #35
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
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25-06-2018, 07:45 PM #36
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25-06-2018, 08:55 PM #37
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.
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26-06-2018, 03:06 PM #38
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26-06-2018, 03:22 PM #39
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26-06-2018, 03:48 PM #40
The Daily pond temp thread
Yep , forecast snow here ! Hoping so more money to be made gritting lol Sent from my SM-S918B...