Evolution Aqua NEXUS 220 Kurzanleitung
INSTALLATION AND INSTRUCTION MANUAL
Evolution Aqua Ltd. - Evolution House - Kellet Close - Wigan - Lancashire - United Kingdom - WN5 0LP
UK
English
NEX220180814MAN
IMPORTANT PLEASE READ:
Your Nexus 220 is supplied with factory fitted components ready
for easy set-up on a pump-fed configuration.
Your Nexus 220 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.
INTRODUCING THE NEXUS 220
2
Congratulations on purchasing an Evolution Aqua Nexus 220 filtration system.
The Nexus 320 and Nexus 220 filtration systems deliver dramatically improved
levels of clarity for Koi ponds. Building on the success of the award winning Nexus
range this new generation of filters feature a re-designed Eazy filter which utilises
K1 Micro Filter Media to deliver improved mechanical filtration. The Nexus filter
systems also use K1 Media in the moving bed to deliver consistent biological
filtration, ultimately providing healthy water and better clarity. There’s also
improved flow in all directions through the Eazy and a better settlement of solids.
Please read this instruction manual carefully from start to finish before attempting
to install your new Nexus 220.
CONTENTS
Nexus 220 parts list PAGE 3
Specifications PAGE 4
Air pump recommendation PAGE 4
Flow rates PAGE 4
Nexus 220 dimensions PAGE 5
How the Nexus 220 works PAGE 6
How are you going to configure the Nexus 220? PAGE 8
Pump Fed installation and operating instructions PAGE 9
Gravity Fed installation and operating instructions PAGE 16
How to get the best from your Nexus filter PAGE 26
Warranty PAGE 27
Spare parts list PAGE 29
Troubleshooting PAGE 30
3
NEXUS 220 PARTS LIST
Your Nexus 220 comes complete with the following items:
4) Eazy Mechanical Filter
is supplied in place in the
Eazy section of your Nexus 220.
5) 1 x 50 litre bag of K1 Media
To be placed in the outer
chamber of the Nexus 220.
2) Hosetail Inlet Assembly
(For use in pump fed
set-up only)
1) Inlet Slide Plate 3) Overflow / By-Pass Collar
(Pre-installed)
6) Nexus Cleaning Instructions:
• Red coloured instructions for
cleaning Gravity Fed installations.
• Blue coloured instructions for
cleaning Pump Fed installations.
7) Cleaning Pipe
Used during cleaning procedure
Maximum Flow Rate
10,000 litres/hr
2,200 UK gallons/hr
2,640 US gallons/hr
Maximum Pond Size
18,000 litres
4,000 UK gallons
4,800 US gallons
Amount of K1 Media supplied 50 litres in outer chamber (Biological)
Amount of K1 Micro supplied 18 litres in Eazy (Mechanical)
Recommended Air Pump Air Pump 75 or above (See Air Pump recommendation)
Total volume of water in filter 510 litres / 112 UK gallons / 135 US gallons
Volume of water in outer chamber 405 litres / 89 UK gallons / 107 US gallons
Volume of water in inner chamber 105 litres / 23 UK gallons / 28 US gallons
Total amount of K1 Media
in the outer chamber Recommended Evolution Aqua Air Pump
50 Litres (as supplied) - 75 Litres Air Pump 75
75 - 100 Litres Air Pump 95
100 - 150 Litres Air Pump 130
NEXUS 220 SPECIFICATIONS
The following Evolution Aqua air pumps are recommended for use with the Nexus 220.
Our recommendations are based on the amount of K1 Media that is in the outer chamber.
You can increase the biological capacity of your Nexus 220 by adding up to 100 litres of
additional K1 Media into the outer chamber. You will however need to ensure that you
have the correct size of air pump to enable the K1 Media to move sufficiently (see below for
recommended size of air pump).
AIR PUMP RECOMMENDATION
FLOW RATES
One of the factors that can have a significant influence on the 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.
4
NEXUS 220 DIMENSIONS
5
6
The Nexus filter is simple yet innovative.
Water enters the Nexus via the inlet into the
inner chamber which works as a basic vortex
allowing larger solids to settle out. The water
then passes through the Eazy where the finer
particles are removed at the mechanical stage
of filtration. From the Eazy the water passes
into the outer chamber where the biological
stage of filtration takes place using the
K1 Media Moving Bed.
The water then passes through the grill into
the Exit Chamber, where it is returned to the
pond through the outlet. The Eazy is cleaned
by diverting the air from the Outer Chamber
to the Eazy using the air valves. Waste is
then discharged through the larger waste
ball valve.
Figure 1.
HOW THE NEXUS 220 WORKS
OUTER CHAMBER
(Biological Stage)
INNER CHAMBER
WITH EAZY
(Mechanical Stage)
WASTE VALVE
(Large 1½”)
OUTER CHAMBER
MAINTENANCE
VALVE (¾”)
OUTLET
AIRLINE & VALVES
(12mm airline &
air valves)
EXIT CHAMBER
(Fitted with
overflow / by-pass
pipe running
through exit
grill plate)
INLET
WASTE OUTLET
& SETTLEMENT
AREA
Figure 2.
7
HOW THE NEXUS 220 WORKS
The Eazy (Mechanical Filtration)
The Eazy is a stainless steel vessel containing a
set volume of static K1 Micro Media (18 litres
for Nexus 220) which is located within the inner
chamber of the Nexus. After water enters the
Nexus it rotates around the Eazy in the inner
chamber with a downward motion allowing the
larger solids to settle to the bottom of the chamber
before passing through the slots of the Eazy into
the static K1 Micro. The water flows from all
angles through the K1 Micro where improved
mechanical filtration and settlement takes place
and fine particles are caught within the K1 Micro.
The water then flows through the slots in the
centre column and into the outer chamber.
The Eazy has been designed so that it can be
easily lifted out of the Nexus should it be needed.
Outer Chamber (Biological Filtration)
The outer chamber of the Nexus contains the moving bed of K1 Media. This is where the
final stage of biological treatment occurs. Biological breakdown occurs through different
strains of bacteria living on the protected surface area on each piece of 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 used.
For higher feed rates additional K1 Media should be added into the outer chamber.
In optimum conditions 250g per day of average protein content food will be broken down
by 50 litres of K1 Media. To ensure excellent biological filtration of a Nexus maintain a
pond pH of 7 or higher. Bacteria conversion rates are reduced in cooler temperatures.
Figure 3. Illustration shows improved water flow
through the Eazy.
8
ENSURE THAT ONCE YOU HAVE ESTABLISHED WHICH SET-UP YOU WANT
TO USE, REFER ONLY TO THE CORRECT SECTION IN THIS MANUAL.
HOW ARE YOU GOING TO CONFIGURE THE NEXUS 220?
PUMP FED
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). Refer to page 9.
GRAVITY FED
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. Refer to page 16.
Figure 4.
Figure 5.
PUMP FED INSTALLATION INSTRUCTIONS
TO INSTALL THE NEXUS 220 ON A PUMP FED SET-UP
PLEASE FOLLOW THE INSTRUCTIONS ON PAGES 10 TO 15.
PUMP FED INSTALLATION INSTRUCTIONS
9
PUMP FED INSTALLATION INSTRUCTIONS
10
IMPORTANT NOTE: It is not sufficient to support the Nexus using
just blocks underneath the feet, as this will lead to damage to
the Nexus. Incorrect installation will render the warranty invalid.
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 filter needs to be well
supported, this is to prevent distortion and damage when it is full of water. The best option
for this is a level, 100mm thick, concrete plinth, although decking or paving slabs would
be sufficient as long as the Nexus sits level and is not allowed to deform under the weight
of the water.
Before installation check that all the jubilee clips on the 3 x EazyConnectors are tight to
prevent leaks. These EazyConnectors can be found on the inlet, outlet and underneath the
centre chamber (this should be accessed before installation by lifting the Nexus 220).
10
Figure 6.
Figure 6.1. Figure 6.2.
Please note: a minimum of 1.2m x 1.0m
solid, level base is needed to support the
Nexus. A 100mm thick concrete plinth is
the best option. The Nexus 220 weighs
in excess of 510kg when operating and
full of water. An unlevel base will cause
irreparable damage to the unit.
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