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Thread: Nexus 220 fines issues
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08-07-2019, 07:54 AM #21
The biggest limitation of Nexus - even with Draco drum inside - is the maximum flow capacity it can handle - way to small for any pond above say 7 - 10.000 L volume. So I guess everyone should design his / her filtration system at first looking at what real flow rate it will allow to handle - to be as close to the desired once per hour pond turnover ratio considered as optimal......
You get what you pay for - or better - what you make yourself.
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08-07-2019, 08:22 AM #22
Any words from EA.?
Off topic but i watched your video and then had a look at your playlists. Your 80's one leaves a lot to be desired lol
Here's an 80's playlist i made earlier.
80's: 80's - YouTube
Enjoy
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08-07-2019, 08:26 AM #23
The Draco sits 11cm above top lip of Nexus on the 310, assume will be the same on the 200..I had same issue as you...my pit has a top hatch...fortunately all I had to do is move the hatch support beams around to miss the Draco. Of course you can't use the Nexus lid, so I made a lid from two sheets of rigid PP with a cut out for the top of the Draco. Between the PP layers I glued several layers of foil wrapped bubble wrap, to make an insulation 'sandwich' lid. Not as pretty as the Nexus lid, but works well..cheers
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08-07-2019, 09:16 AM #24
I'll do the same mate, currently using graphite PE foam carpet underlay which insulates and reduces sound. Have 3x 6mm layers glued together which makes it more rigid but still flexible.
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08-07-2019, 09:42 AM #25
EA have replied already....
Not sure if it's worth pursuing with an answer like this, but I somehow knew it would be my fault and not the Nexus!
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"A slower rate is better than the system circulating too fast, with your size pond I would normally recommend a flow of around 6000 lph, however if it works better at a slower rate I would turn it down, the only other option in terms of green water is to use a bigger UV. In terms of fines, you could minimise the cleaning schedule for a few weeks, this will enable the biofilm to build up more on the media in the Eazy, a good biofilm is the key to removing fines. You experiments seem to back this up so I would slow the water flow down a decrease the cleaning."
If I decrease cleaning the level in the outer area drops significantly, plus the muck starts to stink and it can't be ideal to keep flowing pond water through that muck.
Going to start making pipework and drainage preparations for a Draco. Not sure whether I'll install this summer or test outside mains supply for freezing over winter first and install Draco next spring.
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08-07-2019, 10:01 AM #26
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Re ea’s response then we’ve been here before, they’ll never admit any liability or issues with there system, like I say at the BBKS show there reps said several times that the nexus filters outperform even drum filtration (which we all know is utter balls)
Bottom line is if you have a nexus expect some fines in your water! - it’s going to happen! Ea’s response saying slow the flow down makes sense if your over doing it, but reduced frequency of cleaning!!, that’s just nuts! Does it really strike anyone as good advice to have ever increasing amounts of waste food/ fish waste sat there rotting!??
Ea are off there heads
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08-07-2019, 10:24 AM #27
Not surprised by the response. I think the Nexus is a good filter compared to many, if you can live with fines...the bio side for me with 300litres works well, (albeit after a long maturation time for the K1). But to remove fines you need a finer filter media to catch them, in my opinion Nexus will never be up to that, and technology has moved on..
A Draco is a good solution as a drop in, and it will transform your water (as would any drum) IF you want to retain the Nexus.
Regards freezing water, could it be an option to run a trickle through the supply and T off the Draco clean water feed just next to Draco so you have moving water through insulated supply pipe 24/7? Just a thought..
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08-07-2019, 10:46 AM #28
Yes scamp that will be my exact intention to keep water moving in the pipe.
Tempted to take a few days off work and get the Draco in and running now, but this will lead to too many financial questions from the missus who's eyeing up a new kitchen lol.
Funny thing is fines were an issue when first installing Nexus but last summer with 7000 litres and 8 koi the water was crystal clear so I don't understand why fines have only become a major issue now. My maintenance regime hasn't changed and I don't understand how the could be a relationship between fines and pond volume.
Another funny thing was the recommendation for A bigger UV, yet the 55w is advertised for 50,000 litres and I only have 12 lol.
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08-07-2019, 12:19 PM #29
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That’s exactly what I did (T off of the mains feed I’d run for the drum) and I never had issues with freezing on that side of things, did have an issue with the waste water pipe from the drum freezing, but that just highlights that there’s a dip in my pipework somewhere which allows some water to pool and sit/freeze when temps are low enough, but never had an issue with the feed water freezing because as you say it was always moving even if it was only a small amount!
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08-07-2019, 12:38 PM #30
one thing i will admit to is this,i dont run a nexus on either of my bottom drains on new pond,i have 2 old kc-10 drums,each has one inlet/outlet,one returns over my bakki with 70kg HM and the other goes to an underwater return for movement of water,but as i had my old nexus 200 and i couldnt be bothered messing about selling it,so i stuck it on my skimmer with an old jeboa 12000 variable pump at lowest setting,and yes it has a slab of japmat on exit,and the return for the moment is just a piece of pipe pointing straight down over edge of pond and 2ft into water,,only reason its on is for the bio and skimming food they dont get to lol,i agree with a nexus on its own you will never get gin clear water,but the japmat in exit does help,,,,,andi
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08-07-2019, 12:42 PM #31
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08-07-2019, 03:22 PM #32
For sure new kitchen is the family priority - if it is priority for your Mrs. too - at the end the ultimate beneficiary will be you as well
Just one financial consideration - you might have done it already - adding up resale value of your Nexus plus cost of Draco insert into it on one side (with max. flow limited still by the Nexus to say 7.000 to max 10.000 L/h) - and on the other side stand alone drum QK 22 or other - plus JB Plastics moving bed container - like others here reported to be very happy with - this setup not limiting your flow (20.000 L/h) as well as allowing you to increase your bio-filter capacity at the same time .....provided you can fit it all into your filter pit - maybe not needing to increase the height of it anymore - now considered due to Draco drum insert into your Nexus.
Just food for thought I guess ....
I have been there - tried all sort of things to make my Nexus - first filter I bought - to work properly - by adding un-planted AF, adding EAM Easy drum in-front of it (this helped to resolve fines issue greatly) than throwing into Nexus's exit chamber pump to power de-nitrifying shower combo - after finally looking at it and deciding to get rid of nexus for good - resale price of it paid for all the DIY bio-filters I have done plus some extra left to upgrade my pond pumps to AF DM 30.000 Vario....
Good LuckYou get what you pay for - or better - what you make yourself.
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08-07-2019, 03:27 PM #33
I went through exactly the same as you going through rs, I sold the 220's and wish I hadn't have bought them. I had thought about putting a drum in one of them and seeing if it would make difference, but decided the flow wouldn't be enough. In the end I swapped it all out and started again with drum bio and over shower.
You can come figure it any way you like if you get a bio chamber made up.
Still think it was the best decision even taking a hit on the nexus.
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08-07-2019, 09:08 PM #34
Couldn't help myself and ended up taking the bait and responding to EA, so will see if they continue to reply.
As an experiment I stuffed a pillow down the clean side of the Nexus. After 2 hours the pump was only producing a trickle.
But the fines had practically gone from the pond.
On struggling to remove the now expanded pillow I ended up releasing all the fines back into the pond and now it's worse lol.
I was also covered in blood on both hands which I'd sliced against the Nexus mesh....9 cuts in total lol.
Here's a snap of the 2 hour old pillow which seems to have caught a lot more algae than I expected.... Proving the EA UV also fails to live up to its claimed abilities!
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08-07-2019, 09:33 PM #35
Every thing I hear of ea is getting worse and more common are they getting worse with the equipment or are people noticing that they anit all that good like
Sent from my SM-N950F using TapatalkFreddyboy the legend
"we are water keepers first"
Johnathan
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08-07-2019, 10:51 PM #36
Nexus 220 fines issues
I’m sure in a more “mainstream” hobby, someone would have reported them to the advertising standards authority, probably along with a few other companies who make all these unsubstantiated wild claims.
I think their get out is probably something along the lines of “no two ponds are alike” however, when I see junk about how such and such a filter can comfortably handle a 30,000 litre pond with 87 koi and then read on here someone is struggling with it keeping two goldfish and a piranha in a prefab garden center fibreglass jobbie it really boils my wee wee.
I remember when the nexus first came out and it was “endorsed” by PW, even he changed his tune a few years later.
I can’t recall the exact reasons why (cough) , he did tell me though
Sent from my iPhone using TapatalkLast edited by bigcarpchaser; 08-07-2019 at 11:06 PM.
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08-07-2019, 10:55 PM #37
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08-07-2019, 11:04 PM #38
Lol it’s late
(I would have gone back and edited my post you bugger but you’ve got me fair and square)
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08-07-2019, 11:06 PM #39
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08-07-2019, 11:06 PM #40
Running heater at low temp?
Covering the pond with polycarb should be enough to stop water temps dipping below 6C for the most...