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Advanced filtration systems for Koi ponds now with NEW K+Media

Evolution Aqua have launched the Nexus320+ and Nexus220+filtration systems. Building on the tried and tested technology that has been ever present in the world renowned Nexus, the team at Evolution Aqua have gone even further to enhance their number one Koi pond filter.

 The Nexus320+ and Nexus220+ filters now come with a new filter media called K+Media in the moving bed outer chamber for vastly improved biological filtration and faster filter maturation. The new Nexus+ filters are also supplied “auto ready”, with factory fitted fixings already in place, making it even easier to upgrade to the Nexus Automatic Cleaning System.

Faster filter maturation and unrivalled water clarity

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Now even easier to upgrade to automatic cleaning 

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Maximum pond size: 18,000 litres / 4,000 gallons
Recommended flow rate: 6,000 litres per hour
Maximum flow rate: 10,000 litres per hour
Volume of water in Nexus: 510 litres
Amount of K1 Micro in EAZY: 18 litres
Amount of K+Media supplied: 50 litres
Maximum amount of K+Media: 150 litres


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Maximum pond size: 34,000 litres / 7,500 gallons
Recommended flow rate:11,000 litres per hour
Maximum flow rate:13,000 litres per hour
Volume of water in Nexus:840 litres
Amount of K1 Micro in EAZY:20 litres
Amount of K+Media supplied:100 litres
Maximum amount of K+Media:300 litres


Useful information

FAQs: provide answers to the most frequently asked questions. Start typing the product name + your questions in the search box. Or click here to access the FAQs databse.

Nexus 220+ Manual

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Nexus 320+ Manual

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How the Nexus+ Works

The Nexus+ filter is an innovative biological and mechanical filter system in one. Water from the pond enters the Nexus+ via the inlet into the inner chamber which works as a vortex allowing larger solids to settle out. The water then passes through Eazy filter, where finer particles are removed at the mechanical stage of filtration, thanks to the static bed of K1 Micro filter media.

The mechanically clean water then passes to the outside chamber of the Nexus+ where the new K+Media Moving Bed is located for biological treatment prior to being returned to the pond. At this stage, biological breakdown occurs through different strains of bacteria and filter feeders living on the vast protected surface area of each piece of the K+Media. These bacteria convert Ammonia and Nitrite into less harmful Nitrate. Water then passes through the exit grill into the outlet, returning back to the pond.

 

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Nexus+ Dimensions

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Installing the Nexus+

The Nexus+ MUST be installed on a solid, level base, a minimum of 1.2 metres x 1 metre. Failure to do this will cause irreparable damage to the filter and will therefore invalidate your warranty.

 


GRAVITY-FED INSTALLATIONS

By this we mean that your pump is going to be used to return the filtered water to the pond and therefore your filter will be supplied by gravity via a larger diameter pipe. In this situation the water level in the filter will be at the same level as the pond.

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 PUMP-FED INSTALLATIONS

By this we mean that if your pump is going to be used to supply the water to the filter, and the filtered water then returns back into your pond via gravity, i.e. down a waterfall, or through a large diameter pipe, this is referred to as PUMP FED (i.e. the water is fed to the filter using a pump).

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Specifications

ModelMax Pond SizeMax Flow RateVolume of Water in NexusAmount of K1 Micro in Eazy ChamberAmount of K+Media supplied in Bio-chamberMax Capacity for K+Media
18,000 litres
4,000 UK Gallons
4,800 US Gallons
10,000 litres/hour
2,200 UK Gallons/hr
2,640 US Gallons/hr
510 litres
112 UK Gallons
135 US Gallons
18 litres of K1 Micro inside the Eazy50 litres of K+Media in the bio-chamber150 of K+Media in the bio-chamber
34,000 litres
7,500 UK Gallons
9,000 US Gallons
13,000 litres/hour
2,859 UK Gallons/hr
3,431 US Gallons/hr
840 litres
185 UK Gallons
222 US Gallons
20 litres of K1 Micro in the Eazy100 litres of K+Media in the bio chamber300 litres of K+Media in the bio chamber

New advanced filtration media

Plastic media, for use in biological pond filters - specifically in moving bed bio reactors, was pioneered by Evolution Aqua, some 20 years ago. In recent years, other plastic media have come onto the market, usually with the aim of trying to get more and more surface area. However, one drawback to using plastic media has always been the time it takes to establish a stable biofilm – essential for good filtration.

 After many years of research, Evolution Aqua have now developed a new media that not only gives class leading surface area, but also overcomes the problem of long maturation times.

K+Media is designed and manufactured in the UK by Evolution Aqua. This advanced media, with its innovative design, and class leading surface area provides enhanced biological and mechanical filtration.

 As Evolution Aqua extrude K+Media, Minerals and Enzymes are added to the raw material. The result of this process, unique to Evolution Aqua, is a filtration media that not only outperforms most of its competitors due to its large protected surface area, but also answers the problem of how to speed up the time taken to mature your filter.

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Minerals added for faster filter maturation 

During the extrusion process, Evolution Aqua add a range of minerals, along with magnesium, calcium, enzymes and salt to the raw material that is used to manufacture K+Media. The result means that K+Media will mature much faster than many other types of media.

- The addition of these minerals creates a rough surface on the media. This textured surface has a microscopic honeycomb of peaks and craters that allow waste particles to collect, and nitrifying bacteria to form.

- The minerals act as a food source for the bacteria, helping the bacteria to develop and multiply at a faster rate, further improving maturation times.

- Calcium alone has proven advantages for developing and maintaining effective bio-films.

- The enzymes that are added also help to make the media “sticky” so waste particles can adhere to media easier.

- Salt is added during the extrusion process, which is dissolved during the cooling process, leaving a rough surface on which bio-film can easily adhere.

Increased surface area 

With a new shape and profile, K+Media has also been designed to have an increased and class leading surface area, meaning an overall surface area of 1,350m2 per m3. More importantly for biological filtration, the protected surface area of K+Media is 1,025m2 per m3.  This allows a stable bio-film to form and remain intact when used in moving bed biological filtration, as in the new Nexus+.

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Stable bio-film development

The shape of K+Media optimises the amount of “quiet zones” within the media where a stable bio-film can develop. Whilst K+Media keeps the integral profile of K1 Media at its core, there is an extra layer of cells and fins around the outside of each piece that enable microscopic organisms such as Rotifers and Vorticella to thrive. This is an additional benefit as competitor media do not have such “quiet zones” that would allow these higher lifeforms of filter feeders to develop. The bacteria and organisms that form within the bio-film ensure the media delivers optimum levels of biological filtration in the moving bed, which has been proven filtration technology for many years in the fishkeeping hobby.

Use with PURE Pond products 

Evolution Aqua also recommend using K+Media in combination with the PURE Pond and PURE+ Filter Start Gel to boost bacteria levels which in turn will stick to the media and speed up the maturation process even more.

Frequently Asked Questions

Nexus Plus Filter
Why is the water level in the Nexus outer chamber much lower than in the inner chamber?
• The pump could be too powerful, so the Nexus+ is being emptied before the pond refills it by gravity. • There could be a blockage in the transfer port between the inner and chamber and the outer chamber. You need to back flush it. You can download the instructions to backflush here. • The Eazy...
What size pump do I need for my Nexus?
Maximum recommended flow on the 220 is 10,000lph and the 320 is 13,000lph, however suggested flow rates are lower. Slower is better for fine removal and clearer water. Aim to turn over your pond volume every two to three hours. The Evolution Aqua Varipump range are adjustable, and consume less energy...
Can Nexus+ be gravity or pump fed?
Yes, it can easily be adapted to either filtration method by simply swapping the supplied rubber boots.
How much media does NexusPlus have/need?
The Nexus 220+ comes with 18 litres of K1 Micro in the Eazy (inner chamber,) and 50 litres of K+Media in the outer chamber. The Nexus 320+ comes with 20 litres of K1 Micro in the Eazy (inner chamber,) and 100 litres of K+Media in the outer chamber. For older models, the 300 and 310 contained 40 litres...
Do I need an airpump for NexusPlus?
Yes, it powers the moving bed biological filter and is also vital to the cleaning process. You need an Evolution Aqua Air Pump 75 for a Nexus 220 and an Air Pump 95 for a Nexus 320. If you increase the amount of media in the outer chamber you may well need a more powerful airpump. The correct size ...
How does the Nexus Automatic Control Box work?
Understanding the Nexus Automatic Control Box Video This video will show you how the Nexus Automatic Control Box works. This will help you to troubleshoot any issues you may have encountered along side our other troubleshooting videos for the Nexus Automatic.
How does the Nexus Automatic Air Control Valve Box work?
This video will show you how the Nexus Automatic Air Control Valve Box works. This will help you to troubleshoot any issues you may have encountered along side our other troubleshooting videos for the Nexus Automatic Control Box.
How does the Nexus Automatic Inlet Plate Relay work?
This video will show you how the Nexus Automatic Inlet Plate Relays work. This will help you to troubleshoot any issues you may have encountered along side our other troubleshooting videos for the Nexus Automatic Control Box.
How does the Nexus Automatic Waste Valve Relay work?
This video will show you how the Nexus Automatic Waste Valve Relay works. This will help you to troubleshoot any issues you may have encountered along side our other troubleshooting videos for the Nexus Automatic Control Box.
How long is the standpipe for the return in a Nexus+ that is pump-fed?
The return pipe is 40.5cm long in the 220 and 46cm long in the 320. This is a length of 4" pressure pipe which is factory fitted during production to the return chamber of the Nexus and sets the level of the water in the Nexus. It is removed when using the Nexus in a gravity fed pond. This can be quite...
How much water is in the Nexus+?
Nexus 220+ Total volume of water 510 litres / 112 UK gallons / 135 US gallons Outer chamber 405 litres / 89 UK gallons / 107 US gallons Inner chamber 105 litres / 23 UK gallons / 28 US gallons Nexus 320+ Total volume of water 840 litres / 185 UK gallons / 222 US gallons Outer chamber 635...
My Nexus is not draining to waste when valve is opened.
Remove the outside union on the waste ball valve, open the valve, if no water pours out the blockage is under the Nexus, carefully push a suitable stick (such as a cane) and release the blockage, you can also remove the Eazy and access the pipe from the 1.5" hole in the bottom of the Nexus inner chamber...
The inlet valve does not turn on my Nexus during a cleaning cycle.
Check if the inlet valve is being obstructed. Check if the yellow light is illuminated. If light is not illuminated after 3 minutes, initiate a manual clean to check operation. Check the wiring is correctly installed. Seek advice from a suitably qualified electrician if in doubt. Check the mains...
How do I identify the spare part I need for my Nexus?
You can identify the spare part you need in the Nexus manual, the spare parts list is located on page 29. To view the manual, click here. Alternatively, you can identify the spare part you need from the image below.
The K1 Micro in the Nexus Eazy doesn’t move well during the cleaning cycle
The reasons for this could be one of the following: The air pump is not powerful enough (see Air Pump Recommendation on page 4) There isn’t enough water in the Nexus – check that you used the cleaning pipe to maintain the level on a pump fed system. Check all air fittings and air line for leaks...
I am using a Nexus, my pond has been running for longer than 2 months and my water is cloudy, why?
It is important that the Eazy is flushed a minimum of 2 times during cleaning. This ensures that all the debris collected is flushed out to waste. If the unit is only cleaned once some debris can be returned to the pond, clouding the water. Flush the unit 2 to 3 times as per the cleaning instructions...
My Nexus is blocked with media/debris between the eazy and the main chamber
To clear the block you will need to drain down the outer chamber and clear the kiss points with a small flat screwdriver.You will then need to refill the filter, the media should float up so it can remove by hand.
Can I retrofit a Nexus
It is possible to retrofit a Nexus. However this cannot be done for an Eazypod.
My media is not circulating as good as what it was in the outer chamber of my Nexus.
You will need to check to see if your Airpump is working as it should be. The airline holes may have become blocked with limescale. To rectify this you will need to drain down the outer section and check the airline for any blockages.
How often do I need to change the media in my Nexus?
You should never need to change the media in your filter. You can add more to the outer chamber of your filter if required. Please see question 4 for more information before adding more.
How much water is drained to waste from my Nexus during a cleaning cycle?
In a Nexus 220+ 140 litres of water is drained to waste. In a Nexus 320+ just under 200 litres of water is drained to waste.
What is Nexus Automatic?
The Automatic is a separate system which can be fitted to Nexus filters, to enable automatic cleaning. By combining timers and automatic valves, Nexus can be converted and set to clean itself, as little or as often as required. It can be set to clean at night or while you are on holiday, and once set...
How can I extend the draining time of my Nexus Automatic?
You first need to remove the sticker of the far right side box and change the last dial with a small screwdriver from 50% to 40%, this will extend the cleaning time by one minute.
There is no power to the Nexus control box.
Check the wiring is correctly installed. Seek advice from a suitably qualified electrician if in doubt. Check the mains connection to the control box. Seek advice from a suitably qualified electrician if in doubt. Check the fuses inside the control box. These are located alongside the timer blocks...
How can I locate the fuse in the Nexus control box?
These are located alongside the timer blocks within their own hinged compartments. The fuses are all standard glass fuses; 10 Amp, 5 Amp, 2 Amp, 2 Amp from left to right.Please see the image below, this is where you can locate the fuses.
How do I set a Nexus Automatic to clean at a set time each day?
As its an analogue timer the cleaning frequency will be purely based on time so for example once every 24h, you can dictate the time by pressing manual clean at say 6pm and then it will automatically clean at 6pm the following day. On a twice a day clean you would need to set it to twice a day and then...
Nexus Automatic does not close waste valve
To locate the issue you will need to:Check the relay furthest on the right in the auto box -Check the fuse - Does it light up during a cleaning cycle?If the relay is working as it should, you will need to check the motor. If it’s under warranty you will need to report back to where it was purchased ...
How often will the filter need cleaning?
Typically in summer the filter will require cleaning once or twice a week, however every pond if different and cleaning requirement will vary depending on stocking density, exposure to sun and other variables.
Why do I need to clean my filter more often?
Too much algae. Excessive water flow and pressure. Check pump size. Overloaded with fish. Excessive feeding. Filter blocked through calcium.
I have a nexus 320 pump fed automatic. I want to change to gravity fed. What do I need to purchase to do this.
Nexus Filters are supplied ready for pump fed installations. To convert it to gravity fed, please refer to the manual. https://evolutionaqua.com/pub/media/bss/productattachment/Nexus320_Manual-A5_Size-March-2021.pdfYou would also need to purchase spares for the automatic version. We have a spare parts...
What is the weight of a Nexus filter?
Nexus+ 220 (without water) weigh approximately 70kg on a pallet and Nexus+ 320 weigh approximately 90kg on a pallet.
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