NEXUS Automatic 320+

  • £1,690.00
    Unit price per 




Nexus automatic


Make Nexus the automatic choice

Continuing our long standing reputation for innovation, the Nexus Automatic System now enables Nexus owners to benefit from a fully automated cleaning cycle on their multi award winning Nexus filtration systems. Physically turning ball valves and manually switching pumps on and off will now be a thing of the past thanks to the Nexus Automatic System. All of the key processes that form the cleaning cycle are now controlled automatically with this easy to install kit.

Gravity Fed Setups


Pump Fed Setups



The Nexus Automatic System can be installed on Nexus 220 and
320 filters manufactured after 2006, whether on gravity-fed or
pump-fed installations.
The kit includes a control box which connects up to an automated
waste valve, airpump control box and an automatic inlet slide plate
(for gravity fed models only). Once installed and connected to your
pond pump and mains power the system will carry out cleaning
cycles at timed intervals or when pressing the manual clean button.

Cleaning Cycle

The Nexus Automatic System will control the cleaning cycle fully automatically. Cleaning is done on a timer, which is factory set to clean once every 3 days, however, this is easily adjustable to fit in with your pond requirements. The Nexus Automatic System will run a cleaning cycle which lasts approximately 10 minutes.


Gravity Fed Cleaning Cycle

■ Adjustable timer kicks in to start a cleaning cycle.

■ Control box automatically switches circulating pump off.

■ The water level in the Nexus equalises.

■ Inlet valve closes whilst at the same time air is diverted from the outer bio chamber to the EAZY to clean the media.

■ After the media has been cleaned, the waste valve opens.

■ EAZY is drained to waste and inlet valve opens for a final flush of the EAZY.

■ The waste valve closes.

■ Air is diverted back from the EAZY to the bio chamber.

■ Circulating pump is switched back on.

■ Nexus returns to filtration mode.

Nexus automatic
Nexus Auto

Pump Fed Cleaning Cycle

■ Adjustable timer kicks in to start a cleaning cycle.

■ Control box automatically switches circulating pump off.

■ The water level in the Nexus equalises

■ Air is diverted from the outer bio-chamber to the Eazy to clean the media.

■ After the media inside the Eazy has been cleaned, the automated waste valve opens.

■ Eazy is drained to waste.

■ The automated waste valve closes.

■ Air is diverted back from the Eazy to the biochamber.

■ Circulating pump is switched back on.

■ Nexus returns to filtration mode.removed if needed with the K1 Micro in place. This added feature is ideal when undertaking further maintenance.

Nexus Auto

The generally accepted practice is that when you keep ornamental fish, whether in a pond or in an aquarium, to keep the water fresh, 10% of the volume of the water in the pond/aquarium should be changed on a weekly basis. With this in mind, we recommend that you set your Nexus Automatic system to run a cleaning cycle so as to exchange water in line with this.general parameters of our ponds is turn over rate. This is the time that it takes for the total volume of the pond to pass through the filter system once. We recommend that for ideal performance a turn over rate of every 2 to 3 hours is found to be best.





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

Evolution Aqua have launched the Nexus 320+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 Nexus 320+ 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



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

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.




Nexus+ Dimensions





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.



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.





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).





Model Max Pond Size Max Flow Rate Volume of Water in Nexus Amount of K1 Micro in Eazy Chamber Amount of K+Media supplied in Bio-chamber Max 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 Eazy 50 litres of K+Media in the bio-chamber 150 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 Eazy 100 litres of K+Media in the bio chamber 300 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.


Minerals added for faster filter maturation 

During the extrusion process, Evolution Aqua add a range of minerals, along with magnesiumcalciumenzymes 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 profileK+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+.


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.

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