Evolution Aqua nexus 310 Quick guide

Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England [phone]
Filtration System
Installation and instruction manual
N31011311131MAN

The difference is clear at www.evolutionaqua.com
This manual will give you all the information needed to both install and operate your
Nexus 310. First step is to establish which of the two methods of installation you intend to
use. The Nexus 310 you have bought comes complete with all it requires to connect up
in either of the following congurations:-
ARE YOU PUMP FED? By this we mean that if your pump is going to be used to supply the
water to the lter, and the ltered 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 lter using a pump).
ARE YOU GRAVITY FED? By this we mean that your pump is going to be used to return
the ltered water to the pond and therefore your lter will be supplied by gravity via a
larger diameter pipe. In this situation the water level in the lter will be at the same level
as the pond.
ENSURE THAT ONCE YOU HAVE ESTABLISHED WHICH SET UP YOU WANT
TO USE, REFER ONLY TO THE CORRECT SECTION IN THIS MANUAL.
IMPORTANT PLEASE READ BEFORE
CONTINUING WITH INSTALLATION
Water
Water
Pump
4” Pipe
4” Pipe
4” Pipe
1½” or 2” Pipe
1½” or 2” Pipe
UV
UV

Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England [phone]
Page
Table of contents 2
How your nexus filter works 3
Nexus 310 pump fed installation and operation 4
Nexus 310 gravity fed installation and operation 9
K1 moving bed media 14
How to get the best from your Nexus filter 15
Your Nexus comes complete with the following items:-
TABLE OF CONTENTS
Hose tail inlet assembly
(for use in pump fed setup only)
Bypass collar used in
gravity setup only
K1 media comes already in
place in the Eazy section of
your Nexus 310. The precise
amount needed is at the
level indicated in this picture
Inlet slide plate
2 x 50ltr bags of
K1 media to be placed
in outer chamber of the
Nexus 310

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3
OPERATING YOUR NEXUS:
The Nexus lter is simple yet innovative. Water enters the Nexus via inlet (A) into the inner
chamber (B) which works as a basic vortex allowing larger solids to settle out. The water
then passes through the Eazy (C) where the ner particles are removed and the rst step in
biological treatment takes place. From the Eazy the water passes into the outer chamber
(D) where the remainder of the biological treatment takes place using the K1 Moving Bed
Process (for further information see page 14 on K1 moving bed)
The water then passes
through the grill into
the Exit Chamber (E),
where it is returned
to the pond through
the outlet (F). Waste is
discharged through the
larger Ball valve (G).
The Eazy is cleaned by
diverting the air from
the Outside chamber
to the Eazy using the air
valves (H).
EAZY :
The Eazy is a stainless
steel vessel contain-
ing a set volume of
static K1 media (40L
for Nexus 310) which
is located within the
centre chamber of the
Nexus. After water en-
ters the Nexus it rotates
around the Eazy in the
centre chamber with a
downward motion al-
lowing the larger solids
to settle to the bottom of the chamber before passing through the slots of the Eazy into the
static K1 media. The water ows upwards through the K1 media where mechanical ltra-
tion takes place as any small particles are caught within the K1 media. The water then ows
through the slots in the centre column and into the outer chamber.
OUTER CHAMBER:
The outer chamber of the Nexus contains the K1 Moving Bed. This is where the nal stage
of biological treatment occurs. Biological breakdown occurs through different strains of
bacteria living on the K1 media. These bacteria convert Ammonia and Nitrite into harmless
Nitrate. The amount of Ammonia and Nitrite produced in the pond is dependant on feed
rates and the type of food. For higher feed rates additional K1 media should be added into
the outer chamber (250g/day of average protein content food will be broken down by 50L
of K1).
HOW IT WORKS
C
D
E
F
G
A
H
B

Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England [phone]
Filtration System
Pump fed installation and operation
manual

The difference is clear at www.evolutionaqua.com
5
IMPORTANT PREPARATION
A solid and level base is required. It should be a minimum of 1.2m x 1.0m, to allow easy access
to valves and for maintenance purposes. The Nexus lter needs to be well supported, this is to
prevent possible distortion when it is full of water. The best option for this would be a level 100
mm thick concrete plinth, although decking or paving slabs would be sufcient as long as the
Nexus sits level and is not allowed to deect under the weight of the water.
IMPORTANT NOTE: It is not sufcient to support the Nexus using just blocks underneath the feet,
as this could lead to damage to the Nexus.
Incorrect installation will render the warranty invalid.
Check all the jubilee clips on the 3 are tight to prevent leaks.
NEXUS 310 PUMP FED INSTALLATION
specication nexus eazy 310
Max Flow Rate
13,000 litres/hr
2,859 UK gallons/hr
3,431 US gallons/hr
K1 Media 100 ltrs bio/40 ltrs Eazy
Max Capacity 300 ltrs bio/40 ltrs Eazy
Max Pondsize
34,000 litres
7,500 UK gallons
9,000 US gallons
Rec. Airpump Airpump 95+
Volume of water in
lter
185 UK gallons
840 litres
222 US gallons
Table 1
Total Biological Media litres
50-75
75-100
100-150
150-300
Recommended
Airpump
Airpump 75
Airpump 95
Airpump 130
Airpump 150
Water
4” Pipe
1½” or 2” Pipe UV

Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England [phone]
INSTALLATION EQUIPMENT REQUIRED
1. Pond Pump, with an actual ow rate that delivers to the lter a maximum of
13.000 Ltrs/hour or the entire volume of water in the pond, every two hours,
whichever is the greater.
2. Air Pump. See table 1 on page 5.
3. A valve should be tted before and after the Nexus so that the Nexus can be
isolated if required.
4. It is highly recommended that a suitably sized UV unit is installed with the Nexus for
removal of single celled algae. UV systems are always installed after the pump.
NEXUS 310 PUMP FED INSTALLATION
Your Nexus 310 has been supplied to you ready for you to set up for Pump fed operation.
Pump Fed Installation Steps:
1. Attach the Hosetail assembly (g 1) to the Nexus Inlet (A)
2. Connect the hose/pipework from your pump to the hosetail, cutting down the Hose
tail to t the correct hose, we recommend using 11/2”.
3. Connect your 4” pipework from the Exit pipe (F) back to the Pond.
4. Pour the 2 x 50L K1 media bags into the outside chamber of the Nexus
5. Connect your air pump to the Nexus air inlet (H)
6. Connect the waste valves (G) to your waste outlet as described.
NEXUS 310 PUMP FED INSTALLATION
Fig 1
How to remove the clear lid
from the Eazy. This is a tight
t. Do not remove the screws
H
A
G
F

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7
NEXUS310 PUMP FED INSTALLATION
WASTE PIPE CONNECTION
The waste valves are where the waste from your Nexus is discharged when cleaning and
prior to draining. The 11/2” valve is for the Inner Chamber and is used for when cleaning the
Eazy, while the ¾” valve is for draining the outer chamber (only when and if required).
Both of these valves can be connected using a waste pipe kit (optional extra) as shown in
Figs 2.1-2.3 or can just be discharged individually. If the Nexus is located below your drain
height the waste can be either discharged into a sump where a submersible pump can
be used to pump the waste away or an in-line pump can be connected to the waste line
where it can pump directly to waste.
Once your Nexus is installed and plumbed in as described above, you are ready to ll the
Nexus and begin treating your pond water.
OPERATING YOUR NEXUS 310 PUMP FED
Once your Nexus is installed and plumbed in as instructed, you are ready to ll the Nexus
and begin ltering your pond water.
To ll your Nexus rst you need to open the inlet valve. With a pump fed unit you then need
to switch on your pump.
Once the Nexus is full, you will notice that the K1 Media in the outer chamber, will oat on
the surface of the water. In a pond containing sh, the media will begin moving completely
within a week. This is perfectly normal.
Now your Nexus is full it is time to turn on your air pump to circulate the media making sure
the air valve to the outer chamber is open and the valve to the Eazy is closed.
Fig 2.1 Installed Fig 2.2 Exit to left Fig 2.3 Exit to right

Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England [phone]
NEXUS310 PUMP FED INSTALLATION
CLEANING YOUR NEXUS 310 PUMP FED
The central ‘Eazy’ section of the Nexus will collect all the debris and suspended solids that
come into the lter. In time you will nd out how often you need to clean this, and
probably get into a routine to keep the lter working at its optimum. Each pond is different,
and the regularity of cleaning is affect-
ed by stocking levels and feeding rates
along with other factors such as algae
in the pond.
WHEN TO CLEAN?. The indication that
your lter requires cleaning is when you
see water owing out of the overow as
in Fig 3.2. Normally we would not rec-
ommend leaving the lter uncleaned
more then 3 weeks. The lter can be left
longer if absolutely necessary but this
would not be best practice.
Cleaning procedure
1. Close the valve at the Nexus inlet and immediately switch off your pump.
2. Close the inlet to the inner chamber by inserting inlet slide-plate supplied with your
Nexus. Your Eazy is now isolated from the rest of the system
3. Turn the air valve (H) to divert the air into the Eazy, close the air valve (H) to the
bio stage.
4. The K1 media in the Eazy will now be agitated vigorously, or ‘boil’. As this happens,
all the debris trapped in the K1 will be released into the vortex area of the
central chamber.
5. After about 5 minutes, open the waste valve (G), allowing the waste to drain out
with the water Fig 3.3.
6. Take out the inlet slide plate.
7. Open the valve on the inlet, switch on your circulating pump.
8. Close the waste valve (G).
9. Close the air valve (H), to the inner chamber and open the air valve (H) to the
outer chamber.
10. We would recommend that you perform the cleaning process twice wherever
possible to ensure best results.
Fig 3.1 Normal operation Fig 3.2 Needs cleaning
Fig 3.3

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9
Filtration System
Gravity fed installation and operation
manual

NEXUS 310 GRAVITY FED INSTALLATION
IMPORTANT PREPARATION
A solid and level base is required. It should be a minimum of 1.2m x 1.0m, to allow easy access to valves and for
maintenance purposes. The Nexus lter needs to be well supported, this is to prevent possible distortion when it is full of
water. The best option for this would be a level 100 mm thick concrete plinth, although decking or paving slabs would be
sufcient as long as the Nexus sits level and is not allowed to deect under the weight of the water.
IMPORTANT NOTE: It is not sufcient to support the Nexus using just blocks underneath the feet, as this could lead to dam-
age to the Nexus.
Incorrect installation will render the warranty invalid.
A gravity fed system is where the water level in the Nexus is at the same height as the water level in the pond, therefore it
is critical that the Nexus is installed so that the lip at the top of the Nexus should be level with the proposed nished surface
water level of the pond. The plinth for your Nexus, should be 950mm below where you want the nished pond water
surface to be. Please see diagrams below.
The water on a Gravity fed system should be fed from an appropriately placed bottom drain through at least a 4 inch
(110mm) pipe with as short a length and fewer bends as possible (For optimum ow swept bends should be used). At the
end of the bottom drain line before entering the Nexus, a valve is required so that the line can be shut and the Nexus
isolated.
For long bottom drain pipe runs, it is recommended that a ‘T’ purge valve line
is installed to remove solids that may settle in the bottom drain line. This should
discharge straight to waste (if possible) or into a suitably sized sump.
It is very important that when laying the bottom drain line that there is no section
where the pipework rises then falls as airlocks can form in this area which will block
ow. Figure 1 below describes what should and shouldn’t be done.
Pipework should be level until reaching the lterhouse where it should ideally go
through a swept bend 90 into the Nexus inlet.
Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England [phone]
NEXUS310 GRAVITY FED INSTALLATION
From Pond
To Nexus
From Pond
To Nexus
Fig 1
Water
Pump
4” Pipe
1½” or 2” Pipe
UV

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11
NEXUS 310 GRAVITY FED INSTALLATION
NEXUS 310 GRAVITY FED INSTALLATION
Your Nexus 310 comes with a stand pipe in the outlet. This is for use in PUMP FED SET UPS ONLY.
Please remove the standpipe from the Nexus outlet by undoing the jubilee clip (Fig 2.1)
and removing the 4”- 4” eazyconnector (Fig 2.2), remove the 3 retaining screws (Fig 2.3)
and slide out the 4” PVC pipe (Fig 2.4).
Your nexus 310 is now ready to be connected up for gravity fed operation.
Setup procedure
1. Remove the 4”- 2” eazyconnector from Nexus inlet (A) (Fig 3.1).
2. Attach the 4”-2” eazyconnector (Fig 3.3) to the Nexus Outlet (F) (Fig 3.2).
3. Attach the 4”-4” eazyconnector to the Nexus Inlet (A) (Fig 3.4) and then to the 4”
pipe work from your pond.
4. Connect your water pump to the 4”-2” eazyconnector using suitable pipe work. A
valve should be positioned between the pump and the Nexus, to isolate the
Nexus during cleaning.
5. Pour the 2 x 50L K1 media into the outside chamber (D) of the Nexus (Fig 5).
6. Fit the bypass collar provided into position. See g 4.1 to 4.3.
7. Connect your air pump to the Nexus air valves (H).
8. Connect your pump outlet to the remainder of your pipework including a
UV steriliser.
9. Connect the waste valves (G) to your waste outlet
Fig 2.1
Fig 3.1
Fig 2.2 Fig 2.3 Fig 2.4
Fig 4.1
Fig 3.4
Fig 3.3
Fig 3.2
Fig 4.3Fig 4.2

D
F
G
A
H
B
Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England [phone]
NEXUS 310 GRAVITY FED INSTALLATION
WASTE PIPE CONNECTION
The waste valves are where the waste from your Nexus is discharged when cleaning
and prior to draining. The 11/2” valve is for the Inner Chamber (B) and is used for when
cleaning the Eazy, while the ¾” valve is for draining the outer chamber (D)(only when
and if required).
Both of these valves can be connected using a waste pipe kit (optional extra) as shown
in Figs 6.1-3 or can just be discharged individually. If the Nexus is located below your drain
height the waste can be either discharged into a sump where a submersible pump can
be used to pump the waste away or an in-line pump can be connected to the wasteline
where it can pump directly to waste.
Once your Nexus is installed and plumbed in as described above, you are ready to ll the
Nexus and begin treating your pond water.
Fig 5
Fig 6.1 Installed Fig 6.3 Exit to left
Fig 6.2 Exit to right
How to remove the
clear lid from the Eazy.
This is a tight t.
Do not remove the
screws

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13
NEXUS 310 GRAVITY FED INSTALLATION
OPERATING YOUR NEXUS 310 GRAVITY FED
Once your Nexus is installed and plumbed in as instructed, you are ready to ll the Nexus
and begin ltering your pond water.
To ll your Nexus rst you need to open all the valves before and after the Nexus.
The system should be lled until the water levels are equal.
Once the Nexus is full, you will notice that the K1 Media in the outer chamber,
will oat on the surface of the water. In a pond containing sh the media will begin
moving completely within a week, this is perfectly normal.
Now your Nexus is full it is time to turn on your air pump to circulate the media making
sure the air valve to the outer chamber is open and the air valve to the Eazy is closed.
CLEANING YOUR NEXUS 310 GRAVITY FED
The central ‘Eazy’ section of the Nexus will collect all the debris and suspended solids that
come into the lter. In time you will nd out how often you need to clean this, and
probably get into a routine to keep the lter working at its optimum. Each pond is different,
and the regularity of cleaning is affected by stocking levels and feeding rates along with
other factors such as algae in the pond.
WHEN TO CLEAN? You may also notice that the water level in the outer chamber – the
Biological stage – lowers as water is prevented from getting through the Eazy as quickly as
it is being pumped back into the pond. When this water level falls beneath the level of the
bypass pipe, this is the indication that you should clean the Eazy. Normally we would not
recommend leaving the lter uncleaned more then 3 weeks. The lter can be left longer if
absolutely necessary but this would not be best practice.
Cleaning procedure
1. Switch off your circulation pump.
2. Close the inlet to the Nexus by inserting inlet slide-plate supplied with your
Nexus. Your Eazy is now isolated from the rest of the system
3. Turn the air valve to divert the air into the Eazy, close the air valve to the bio stage.
4. The K1 media in the Eazy will now be agitated vigorously, or ‘boil’. As this happens,
all the debris trapped in the K1 will be released into the vortex area of the
central chamber.
5. After about 5 minutes, open the waste valve (G), allowing the waste to drain out
with the water.
6. Close the waste valve (G).
7. Take out the slide plate
8. We would recommend that you perform the cleaning process twice wherever
possible to ensure best results.
9. Close the air valve, to the inner chamber and open the air valve to the
outer chamber.
10. Switch on your circulation pump.
LONGER PERIOD OF TIME BETWEEN CLEANING
Regular cleaning of the Eazy is essential to maintain your pond at its best. Build up of
detritus in any pond lter can harbour pathogens, and other pollutants which may
harm your sh.
At times, you may want to leave your lter for longer than you would normally want
between cleaning, perhaps if you go on holiday. In these instances, your Nexus 310 incor-
porates a Bypass, which will prevent the bio stage from emptying, and therefore potentially
starving your pump of water, should your Eazy become full of debris. The lter bypass should
be turned 90 degree as per gs. 7.1-7.3, when you need to leave your lter for longer peri-
ods of time such as holidays etc. this will allow the water to bypass the eazy should it be-

Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England [phone]
NEXUS 310 GRAVITY FED INSTALLATION
come blocked. On return from your holidays - turn the bypass back to 12.00 o’clock see Fig
7.1. Normally we would not recommend leaving the lter uncleaned more then 3 weeks.
The lter can be left longer if absolutely necessary but this would not be best practice.
K1 MOVING BED MEDIA
K1 Moving Bed Media has been scientically tried and tested in sh farming and waste
treatment for over 10 years. Developed by Professor Halvard Ødergard at Trondheim
University of Science and Technology the K1 Moving Bed Media bio lm process has been
designed specically to create the most effective environment for the nitrication process
to take place. The media is engineered in a wheel shape and is slightly positively buoyant,
allowing a small amount of water ow created by adding air to the process) to circulate
the media throughout the vessel.
Oxygen and food (ammonia and nitrite) gives the bacteria the means to grow, whilst the
K1 media provides maximum surface area for the bacteria to colonise and produce bio
lm. It is this process, which removes harmful ammonia and nitrite from the water. As the K1
media chaotically circulates within the bio tank, it causes old dead bacteria/bio lm on the
outside, to be removed making space for new younger heavier feeding bacteria/bio lm
to colonise.
Within the wheel, is a protected surface, which enables colonies of bacteria to naturally
follow their life cycle, maturing and dying, in turn fuelling the latter stages of nitrication
conversion process. It also assists in the breakdown of any small particles passing through
from the mechanical stage. Therefore, the K1 media maintains both a young biolm & a
maturing bio lm providing a more consistent lter performance, whilst improving water
quality, encouraging healthier Koi and aiding in reducing green water and blanket weed.
Due to chaotic movement of K1 media, the process is self-cleaning and requires no
maintenance. This allows the lter to reach optimum effectiveness without the disturbance
of periodic maintenance, avoiding unnecessary loss of bacteria within the lter preventing
high levels of ammonia and nitrite within the water. The other major benet of K1 media is
the huge ‘active’ surface area available for the bacteria to grow on compared to other
types of media. This feature allows for smaller lter design, e.g. the Nexus, whilst providing
increased biological efciency.
Fig 7.1 Fig 7.2 Fig 7.3
K1 MOVING BED MEDIA
New media Low loading mature Heavy loading mature

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15
HOW TO GET THE BEST FROM YOUR NEXUS FILTER
HOW TO GET THE BEST FROM YOUR NEXUS FILTER
Take a look of our new Pure Pond bacteria gel balls.
With over 8 billion bacteria per Litre of Pure Pond Balls, your pond will shine,
especially if you add them monthly into the K1 Moving bed.
The Pure Pond balls are made from a biodegradable polymer, and crammed
full of bacteria that are slowly released when they are needed most.
When you introduce the Pure Pond balls into the biological chamber of your Nexus,
they become one with moving bed, agitating alongside the K1 media, just waiting
to smooth out the peaks and troughs of the Ammonia/Nitrite cycle.
Contact your Nexus dealer to nd out more.
Getting the most from your Nexus has never been easier.
Pure Pond bacteria gel balls in the
K1 Moving Bed Filter.

WARRANTY CARD
WARRANTY CARD
WARRANTY PROVISIONS
1. Your Nexus Filter is covered by your warranty for 1 year from the date of purchase
(2 years if the warranty card is correctly completed and returned) provided that:
a. It is installed, operated and regularly maintained in accordance with the
instruction manual.
b. Any warranty repairs to the Nexus must be undertaken by Evolution Aqua Ltd or
its authorised representatives.
c. If returning a product for warranty repair it must be returned in the original
packaging (or a suitable alternative) together with your proof of purchase. Evolution
Aqua Ltd. accepts no responsibility for damage during transit or consequential loss
relating to this.
2. Though the warranty period may not have expired, payment for repairs must be
made in the following cases:
a. When the fault is due to misuse or unauthorised repairs have been attempted.
b. When the fault is due to fire, natural disaster, act of God etc.
c. If the warranty has been lost, incorrectly completed or details
fraudulently changed.
Evolution Aqua Ltd. accepts no responsibility or liability for any consequential loss
caused by or arising from the use of any Evolution Aqua products. Therefore, any
dispute arising from the provisions of the warranty will be dealt with under the laws of
England and Wales subject to the exclusive jurisdiction of the English Courts.
ACTIVATE YOUR 1 YEAR EXTRA FREE WARRANTY COVER,
COMPLETE THE FORM & POST IT TODAY,
OR GO TO www.evolutionaqua.com
AND COMPLETE ONLINE.
NEXUS WARRANTIES - EVOLUTION AQUA - KELLET CLOSE - WIGAN - LANCASHIRE - WN5 0LP - TEL: [phone]

WARRANTY CARD
Your Name:
Customer Address:
Postcode:
Country:
Tel:
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Email
Purchased From:
Address:
Postcode:
Country:
Tel:
Web:
Date of Purchase: / /
Model:
Serial Number:
Signature: Date: / /
I have read and accept the terms and conditions listed in the warranty card,
and understand the obligations of the Customer under this warranty.
Returning this registration form will amount to your consent for us to disclose your details and other personal
information to other companies within the Evolution Aqua group including any subsidiary company or subcontractor
of Evolution Aqua for the purposes of performing our obligations under the warranty. Evolution Aqua Ltd. may
contact you in the future with product updates or offers, which may be of interest to you. If you do not wish to
receive this information please tick this box.
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