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Thread: Nexus 220 fines issues
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09-07-2019, 01:26 PM #81
I'm not saying they are perfect as but I don't know why it's not working for you, I set up a pond for my partners grandad and that's running really well the water is crystal, it's 10 ft by 6ft by 5ft deep it's runs from bottom drain to 220 then gravity through a evo 55 round the back of pond to superfish 12000 pump which only pushes it about ten inches to mid water return with is angled at about 4 o'clock if that makes any sence he has added about an extra 30 ltrs of k1 outer chamber over the Two years it's been in for, his stock level is 12 /13 koi to about 9/10 inch the air pump running it is a 120 ltr a min which also runs a 10 inch air disc sat onto of his bottom drain , he's feeding osw the same as me with extra treats of mealworm and prawns and garden peas the ponds only cover is a twin layer of bird netting to keep it kid safe he cleans the nexus once a week and tests water before cleaning also he has a surface skimmer running constantly , the only issue he has had was blanket weed which was remedied with clover leaf treatment also I put a tap divert so he can run a 60 CM water Blade in the summer at a desired flow, I know the nexus let's fines through as my 310 does and even with upgraded mesh on the Cetus I still get It I also have a skimmer running separate which I've upgraded to a jap mat filter in the basket , I have 250ltrs of k1 in outer chamber but my water is almost clear I'm just being a fussy bugger I'm not telling my grand mother how to suck eggs, just trying to help as you have got something going wrong there
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freddyboy Thanked / Liked this Post
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09-07-2019, 01:39 PM #82
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RS2OOO Thanked / Liked this Post
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09-07-2019, 02:17 PM #83
Sounds almost identical to my set up tbh.
Had crystal clear water last year at 7000 litres.
This year at 12000 litres and koi have grown and eating a lot more.
It's a mystery as to why fines are worse this year because if they are getting through now they should have been last year too.
Main diet is Saki growth at present. This time last year was NT labs probiotic growth.
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freddyboy Thanked / Liked this Post
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09-07-2019, 02:58 PM #84
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Nexus 220 fines issues
Is it the change in food then (in part!?)
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09-07-2019, 03:28 PM #85
Fair question Blue, it might be.
I notice on some koi their poo breaks off into clouds of tiny pieces on this food and that didn't happen last year.
But also some are picking away at the algae this year but I had no algae last year as liner was new.
Either of those things might be contributing.
Last year the poos were big solid pieces and you could see them in the bottom of the Nexus, don't recall seeing any like that this year, just a pile of "dirt".
Got it in my head that I'm getting a drum regardless.... Just wish it had been before my big BBQ this weekend as pond looks pretty crappy at the moment.
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09-07-2019, 04:36 PM #86
Are you getting a drop in draco for the nexus RS.
When I worked on the rigs for 3 on 3 off rota So being away for 3 weeks at a time.
My pond was nt touched at all. Our lass only had to feed them. The drum and the nexus did the job.
What I am getting at is you can trust in them to be left alone mate.
There bloody good.
Best thing I invested in on the pond lol
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09-07-2019, 04:46 PM #87
I was going to say this as s similar thing has happened to a mate after he changed from some garden centre food to something “better” from QK. His water has gone from pretty good to murky since. He’s also probably overfeeding and not running a nexus but a cloverleaf but maybe it’s a similar issue which could be partly solved by changing foods?
Doesn’t solve the inherent design flaws obviously.
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09-07-2019, 06:24 PM #88
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09-07-2019, 06:27 PM #89
Just an observation, when I switch every year from Saki multi season to saki growth, my water takes a tinge..no fines as have a Draco, but definitely not as clear as with the multi...whether growth poos breakup quicker or they Sh,t more with the growth I could’nt be sure..
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09-07-2019, 09:08 PM #90
That's interesting scamp, could be contributing to what I'm seeing.
Stuck this in the Nexus outlet tonight to see how long it took to block the pump.... 2.5 hours.
Definitely proves the shortfall in mechanical filtration.
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09-07-2019, 10:40 PM #91
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10-07-2019, 06:02 AM #92
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10-07-2019, 06:22 AM #93
Thats not great at all. To me it looks as if your UV is working. It’s clumping the algae together and it’s going into the filter....problem is it’s going straight out again! Personally I would not upgrade the UV until you decide on the Nexus...either to change or upgrade on the Draco. A Drum would remove that, and your water should be less green..
I’ve been away for a few weeks ( 10 days at a time) and Draco has been fine...but like you had concerns if it stopped. But that can be true of pumps and most equipment, there is always a risk something fails, the day you travel! Koi law...
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10-07-2019, 06:55 AM #94
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Only problems I had with having a Draco fitted was I had a drive motor fail, and if your relying on mains water for the cleaning then your at the mercy of your water supplier and how good they are/whether you get water shut offs due to leaks!
I had it twice/three times where the water had been turned off locally for a spell and this meant the drum blocked - couldn’t clean, which then caused an overflow, but then the pump running dry (my pump is supposed to auto shut off too if it runs dry, but it apparently doesn’t!)
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10-07-2019, 06:56 AM #95
Nice one I agree there. Like you mate. You learn to trust the system and setup.
And anything can break down. At any given time.
And that green stuff does look like it is clumping.
I remember Lee coming round when I was away lol.
Our lass said to him fred will go mad at me.
He will think I am not caring about his pond.
Lee told her about NPS. And said don t worry pam. The pond is looking after its self with the drum.
And he told her what to do. Water changes
And less feed and all that stuff.
I had told her that. But I forgot to show her water testing Haha.
So Lee shown her that. Good old Lee.
When I got home the water was always crystal clear.
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10-07-2019, 06:59 AM #96
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Ajm Thanked / Liked this Post
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10-07-2019, 07:44 AM #97
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freddyboy Thanked / Liked this Post
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10-07-2019, 05:10 PM #98
Drive motor on mine failed, had a new one delivered next day.
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freddyboy Thanked / Liked this Post
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10-07-2019, 07:10 PM #99
Thanks all for the posts and suggestions.
99% sure I'll be getting a Draco. They offer 10% off every year on Black Friday.... Not sure if I can wait till then but might drop it into conversation with suppliers to see if there's any movement on buying one now.
Already ordered a Macerator to connect to Nexus outlet, got Tuesday off work to add a course of blocks to the filter pit, and will buy some plastic speedfit PE-X 15mm pipe to T-off from downstairs toilet to supply the filter pit (80 feet in total). I read that the plastic stuff is less prone to bursts if it did freeze. Will obviously insulate it.
Cleaned Nexus on Sunday and just done it again now - To be fair it was holding a LOT of dirt, even slowed down the sump pump. Took 5 boils to get rid of all the muck.
Stuffy:
Yes, added more K1 to outer chamber (26 litres - 76 in total). Probably needs more but that would cost more K1 and a higher powered air pump. I feel inner chamber could do with some more micro but EA recommend against this so I've not touched it.
Scamp:
You are right - the UV is working. Left a bucket of water overnight and the green was settled on bottom / floating on top. The water went clear. So definitely a mechanical issue.
Blue:
Does the Draco not have an overflow system in case of blockage / mains water outage? I'd have expected something like this as standard. My Jebao TSP pump also didn't turn off when it ran dry. It is supposed to. (Accidentally turned it back on before removing centre cleaning pipe from Nexus).
Freddy:
Yep, almost certainly getting a Draco. Whilst it makes for an expensive overall set-up, its a lot cheaper and easier to add a Draco to existing set up instead of selling Nexus for pennies and redesigning everything and going broke!
Thanks again to all - Learned a fair bit from this thread which only started out as a moan!
Gonna cost me a few quid though lol.
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10-07-2019, 07:35 PM #100
I do my 310 every other day sometimes every day and back flush after chamber is empty I think this helps was the crap from inside to out also helps keep outer chamber clean too, mines just non return flap I think you have a tube for cleaning cycle it always takes 2/3 flushes to get the crap out and sometimes use jet wash to clean k1 in centre, prob do that once a month during summer months
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Best plants to remove Nitrate
pug has a very impressive veg filter on his pond, have a look at some of his his youtube videos....