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Thread: Nexus 320 help
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12-07-2017, 10:21 PM #1
Nexus 320 help
Hi folks.
I have just purchased and installed a nexus 320 however I am having trouble getting it to operate efficiently.
Basically the outer chamber isn't filling up as quick as the pump is pumping the water out meaning (though the inner chamber remains full) I am having to reduce the flow back in to the pond otherwise it runs dry.
It seems either my pump is too powerful (doubtful ) or there is a blockage between the inner and outer chambers restricting the flow.
I have cleaned the inner chamber and and can't physically see a blockage
any ideas would be Great
many thanks
matt
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12-07-2017, 10:39 PM #2
What`s the set up,is it a gravity fed 320 with the water pumped from the outer chamber to the pond?.If it is,then the pump is removing the water faster than it can be replenished.If this set up is so,it`s quite unusual.
Ray.
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12-07-2017, 10:44 PM #3
I had the same problem mate
My 320 was set too high and it drained the outer chamber quicker than it could fill up
new pond,starting digging next week
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12-07-2017, 10:46 PM #4
What pump you using? I'm using a 11000lph
new pond,starting digging next week
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13-07-2017, 07:12 AM #5
Hi Matt if you've checked for blockages in the slits from inner to outer chamber, and as Ghost says your height is ok, it's probably too fast a flow is the cause. They are designed for a max flow of 2800 GPH(13k lph) cheers
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GHOSTDOG Thanked / Liked this Post
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13-07-2017, 09:19 AM #6
Thanks for your replies.
My pond is gravity fed and feeds a vortex filter.
From this it feeds the nexus 320.
I think the level is bang on.
My pump is a sequence 80k but I can't find anywhere online that states the flow rate.
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13-07-2017, 10:45 AM #7
Hi Matt if you take a picture of the pump label someone on here maybe able to help. This forum is full of us geeks!
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13-07-2017, 11:02 AM #8
silly question here but it wasnt run pump fed before was it,i.e there isnt a piece of pipe in the outlet,if so this need removing,andi
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freddyboy Thanked / Liked this Post
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13-07-2017, 11:49 AM #9
something else i just thought of if its a 320,does it have the overflow pipe from eazy section to outlet,if it has then is it set too low,you could be pulling water from eazy and bio and that flow could be slowing the fill up from eazy to bio,also when i got my nexus it was minging,and had to stick jetwash down middle tube to clear all the crud that had built up,i also jetwashed all the holes which are under the plastic outer part of the eazy section but in the bio section,these also minging,andi
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RJW2012 Thanked / Liked this Post
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13-07-2017, 12:28 PM #10
How many pumps. How's it getting from one filter to the next filter. IE from vortex to nexus. Then from nexus to pond. When I first ran my nexus with out drum it did the same. Thought the pump was to large. It was nt. Wrong hight. Level.
before the drum was bought Draco. I was going to run my ultra sieve gravity fed from bottom drain a pump after ultra sieve. And a slightly larger pump after nexus. With a balance line. Could this be your problem
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13-07-2017, 12:31 PM #11
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13-07-2017, 12:47 PM #12
You could also just try a backwash, so when the central Easy section is empty (you have drained the centre section to waste). Simply pull out the cleaning pipe/bung and let the water purge backwards from outer section into inner section. Then drain that to waste also.
That should have the same effect as cleaning all the transfer ports mentioned by Andi above.
Failing that it sounds like the balance isn't quite right.
Rob.
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freddyboy Thanked / Liked this Post
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13-07-2017, 07:58 PM #13
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13-07-2017, 08:17 PM #14
If what I've just read by googling sequence ebs80k is correct.your pump does 5800gph or 21956 lph and uses 275w.so that explains why it's emptying the nexus then lol.if I was you I'd get a smaller cheaper to run pump.andi
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13-07-2017, 08:20 PM #15
Hi thanks for the thoughts.
It is a brand new nexus 320 and I have set it up as per instructions for a gravity fed system and removed the appropriate pipe.
It is fed via 4" pipe from a large vortex filter. The problem is not the amount of water entering the nexus but the flow between the two chambers.
I have carried out several back flushes on it to try and remove any potential blockage.
It seems to me as the water is not entering quickly enough through the slits as media is blocking the water flow.
The overflow pipe is there but isn't contributing to the problem
Also so in regards to levels I believe it is bang on as the previous owner had his nexus 320 working perfectly from this level.
Thanks again
matt
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13-07-2017, 08:25 PM #16
Thanks andy could I have the link you used as I have searched for ages on google for that flow rate but could not find anything ?
Thanks
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13-07-2017, 08:27 PM #17
So apart from your pump being too big.what you need is to set it up as if you have a cetus sieve In front.which means fitting a balance pipe.check ea website it will show you.good luck.andi
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13-07-2017, 08:36 PM #18
On phone and dunno how lol.but it was from a website called underwater warehouse.andi
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13-07-2017, 09:55 PM #19
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Nexus 320 help
Im pretty sure a 4" pipe under gravity can only flow around 15,000 ltrs per hour? so if the pump is a 21,000 ltr per hour, if there is littke restriction and its pumping the stated flow rate then there in lies the problem and would explain the bio chamber emptying quicker than the inner, the gravity feed cannot keep up with the pump
Also ea does state the nexus 320 max flow rate is 13,000 ltrs per hour. Maybe that is the maximum flow they can manage to transfer between each chamber?
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14-07-2017, 05:48 AM #20
Here is picture balance line
Pump is also behind sieve. Hope this helps.
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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....