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Thread: Nexus
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01-07-2020, 12:15 PM #1
Nexus
I'm in a bit of a situation I'm running a 1800 gallon pond and thinking of a nexus But I'm only pump fed is this possible for a nexus my pond is 36" above ground any ideas.
Thanks ian
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01-07-2020, 01:35 PM #2
If you go on the Evolution Aqua website, there's loads of info including full installation instructions to download.
I wouldn't see a problem in principle, the Nexus can be pump- or gravity-fed.
Not everyone on this site is a fan, as you'll find...I've only got one recently (gravity) as part of an expanded pond, and although it's too early for me to judge completely, I will say that cleaning is a dream but I have a current struggle with clarity. To be fair, that might be partly my own fault because I flooded it, and then had to turn off the UV for treatment.23,000l, bottom drain, splash return, EA Nexus 320 Auto, EA evo55 UV, EA AP130, Oase Aquamax 14000.
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freddyboy Thanked / Liked this Post
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01-07-2020, 01:56 PM #3
Thanks it's just the thought of having a big filter so high up in the air I'm currently useing a eazypod plus a trickle tower and a bakki shower it's lust looking a bit crapted up.
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01-07-2020, 02:58 PM #4
I have a Nexus 320 in my pond alongside a 5 bay chamber filter.
I am not impressed at the mechanical filtration on my pond.
The Nexus relies on K1 media in the central section and this does remove a lot but by no way enough on its own.
I am now thinking about filter wool, filter socks or a new drum filter to get the water quality up!
The Cetus Sieve is worth looking at as these can run alongside the Nexus! That is what i wish I had done (well if I had the money at that time!).
On an 1800 gallon pond I reckon Cetus and Nexus would would well!
Mode10,118Gal 46,000l
Nexus320
Cloverleaf GenesisII(5 bay)
2x13,000lph pumps, 2xEvoAqua75wUV
11 Koi
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freddyboy Thanked / Liked this Post
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01-07-2020, 03:30 PM #5
I'm the first to criticise the Nexus and other EA products, in fact I've just finished sla**ing my Nexus off on another thread.
But I think a Nexus 220 (with K1 Micro in the Eazy section) on an 1800 gallon pond is probably the best thing around second to a drum and would make a good upgrade from the eazypod.
If buying 2nd hand go for it.
If buying new, save up a little more and get a drum.
The Nexus will be fine pump fed, but obviously the weaknesses of a pump fed system will still remain.
If there's a possibility of making your pond bigger in the future, again, consider a drum over a Nexus. My Nexus was fantastic at 1600 gallons. Once pond increased to 2600 gallons the Nexus was still fine over winter and spring, but once summer, algae and heavy feeding came the fines were ridiculous. This was with 10 medium sized Koi.
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01-07-2020, 03:52 PM #6
Ok thanks for the advice think I'll look into a nexus and some how try a hide it
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01-07-2020, 04:16 PM #7
the nexus was all the rage before drums came along. in 20 years from now maybe even before. probably having a go at the drums and bio tank that are out now.
the only thing i don t like about the nexus, is that ea don t tell it how it is. going by what i read on here. i don t know what there like as a stand alone nexus. because i have never run one stand alone.
but with a drop in drum in them
i think there the buisness. that s my opinion. and with 320lts of media inside of it i think it does a very very good job. on the bio side of things. crystal clear water. and water parameters spot on.
so for me that is all i want. a sieve in front is what you want. thats why they brought the cetus sieve out to deal with fines.
but as RS has said what you would pay for new on those 2 items. you can get a drum and bio tank.
pump fed i know some times cannot be helped. but if i had to go pump fed again. it would be with a retro bottom drain.
fred
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01-07-2020, 04:16 PM #8
if you are pump fed, and your pond is 3ft above ground, how about running the nexus in gravity?
save having to jack it up high...
you could part drain the pond, keep your current easy pod filtration going, and chop in a 4" midwater feed with a valve to the nexus....
is it a liner pond or fiberglassed?
Edit:
Or as Freddy says retro bottom drain would be better.
Save having to hoover the pond bottom...Last edited by davethefish1; 01-07-2020 at 06:00 PM.
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01-07-2020, 09:37 PM #9
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01-07-2020, 10:10 PM #10
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01-07-2020, 10:30 PM #11
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01-07-2020, 11:26 PM #12
The arguments on all sides are pretty valid on this thread and reading back from the top its interesting to see the opinions and suggestions.
There's other plus sides to a Nexus that nobody mentions.
All your filtration is in a single footprint, whether you have a drop in drum or the original easy section. This also means less overall pipework thus less opportunities for leaks.
And whilst it is a large footprint, adding a 220 instantly gives you a 510 litre pond extension, a 320 adds 840 litres, allowing you to add one or 2 more koi to the pond!
The main negative side is that it doesn't handle small particles anything like a drum does, and if you don't check it regularly it can block up very quickly in summer despite the overflow, leaving your pump running dry, as mine did on a daily basis last year.
Mine also took ages to mature. 9 months before my nitrites were down to safe levels.
Sent from my Pixel 2 using Tapatalk
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freddyboy Thanked / Liked this Post
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02-07-2020, 12:48 AM #13
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02-07-2020, 10:53 AM #14
The part of my pond where the Koi swim is 10,994 litres when filled to the top, but really its 2cm below the top so actually holds 10,761 litres.
The part of my pond where the Anoxic filter goes is 720 litres.
The Nexus is not filled up to the 510 litre line, so currently holds 440 litres.
The pipework between bottom drain and filter, then back from filter to pond holds 56 litres.
The UV holds approx. 12 litres.
So suddenly my 10761 litre pond is actually a 11,979 litre pond.
Obviously it is standard practice to round this up to 12,000 litres in case it rains
So for stocking with fish and adding medications, my 10,760 litre pond becomes a 12,000 litre pond.
Or 2630 gallons, which I round down to 2600 in case of evaporation
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02-07-2020, 11:09 AM #15
I agree with the positive points of a Nexus, as a 'Proper' Koi filter, capable of dealing with Koi poo, and with decent Bio, there's not alot better out there, without going drum and bio etc. Its an all in one approach - ease of cleaning and small footprint are all positives. Yes it needs to cleaned frequently in summer, but its easy to do, and shows its taking the rubbish out of the pond.
I ran my 320 for a few years before I went with a drop in drum, now I have a great filter with huge bio capacity, and without altering pipework. But its all personal choice, its clear a Nexus on its own, pump fed, will not clear fines from the water, but that doesn't bother everyone and its quite capable of keeping your water parameters in check..Cheers
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