200

2 0 0 / 3 0 0

Installation & Operating

Instructions

Note: Do not attempt to operate this unit before reading the manual thoroughly

Manufactured by Evolution Aqua Ltd.

Evolution House

Kellett Close

Wigan WN5 0LP

Tel: +44 (0) 1942 216554

Fax: +44 (0) 1942 216562

Web: www.evolutionaqua.com

E-mail: [email protected]

Thank you for purchasing your Nexus Eazy™ filter.

We are sure you will be delighted with its performance. You should have already decided whether your filter system will be pump or gravity fed. Please go to the relevant section and read thoroughly before installation.

The Nexus Eazy filtration unit has been designed on the principles of minimum maintenance, high performance and a compact foot print. This design delivers optimum water quality by using the Kaldnes

Moving Bed ™ process.

Basic Operation Nexus:

This section briefly explains the basic operation of the

Nexus filtration system. Water is delivered to the inlet of the filter and enters chamber A (see fig. 15). This chamber is the main mechanical stage of the filter.

All of the solids and debris are stopped in chamber A and are sumped to waste via a 1.5 inch ball valve provided. The water then passes to chamber B containing the kaldnes Moving Bed where the biological filtration takes place. The air ring at the base of chamber B constantly agitates the media. Chambers C & D are empty and allow the clean water to return to the pond.

692 D

Basic Operation Eazy :

The Eazy™ is a stainless steel vessel containing a volume of static

K1 media which is located within the centre chamber of the Nexus.

Water enters the centre chamber and then enters the ‘Eazy’ via slots in the lower half of the unit. This results in a downward flow causing many of the larger solids to settle out prior to entering the Eazy. The size of the slots will not allow large mechanical waste to enter the cylinder thus acting as a first stage mechanical filtration. The water then passes through the static K1 media, utilising up and side flow and this process causes the fine solids to become entrapped. The mechanically clean water then passes to the outside chamber of the Nexus where the Kaldnes moving bed™ is located for biological treatment, prior to being returned to the pond.

Nexus Eazy Specifications and Flow Rates

Follow your relevant section carefully and your filter will perform correctly providing a perfect environment for your Koi. 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. On Nexus ponds a turn over of every 2 to 3 hours is found to be best.

Nexus Eazy 200

Max flow rate: 10,000 litres/hr 2,200 UK or

2,640 US gallons/hr

Max pond size: 18,000 litres/hr 4,000 UK or

4,800 US gallons

Kaldnes K1: 50 litres (for bio stage – max

150 litres possible)

30 litres (for Eazy – max 30

litres possible)

189

1250

425

766.5

max water level

2 8

Nexus Eazy Rev. 1.03 page 2

Nexus Eazy 300

Max flow rate: 15,000 litres/hr 3,300 UK or

3,900 US gallons/hr

Max pond size: 34,000 litres/hr 7,500 UK or

9,000 US gallons

Kaldnes K1: 100 litres (for bio stage – max

200 litres possible)

45 litres (for Eazy – max 45 litres possible)

1434

868

725

1131 D

OUTLET

Fig. 2

Fig. 1

605 445

51

INLET

619

516

52.5

52.2°

Fig. 4

WATERLEVEL

Fig. 6

Fig. 3

Fig. 5

Fig. 7

On opening your Nexus you will find the

following;

Fig. 8

Fig.1 Nexus 200 or 300 main body

Fig.2 Stainless steel Eazy vessel, comes fitted

Fig.3 Stainless steel centre pipe, comes fitted

Fig.4 Kaldnes K1 30 litres, for the Eazy 200, 45 litres

for the Eazy 300

Fig.5 Nexus isolation pipe, used during cleaning.

Fig. 10

Fig. 9

Fig. 11

Nexus Eazy Rev. 1.03 page 3

Fig.6 Kaldnes K1 for bio chamber Nexus 200 = 50

litres Nexus 300 = 100 litres.

Fig.7 Inlet plate (Gravity fed only).

Fig.8 Weir plate, comes fitted (Nexus 200

pump fed only).

Fig.9 Standpipe (Nexus 300 pump fed only).

Fig.10 1.5 inch ball valve, for pressure inlet pump

fed only.

Fig.11 Two rubber connecting adapters, fitted

Pump Fed Systems

The nexus filtration system can be used in two ways pump or gravity fed (fig.12 –pump fed)

Pond

Return to

Pond

Reducer

(If Required)

Installation Section Pump + Gravity Fed

We recommend that you read all the following sections, then select the appropriate installation section.

• Preparation

• Installation Equipment

• Pump Fed installation Section

Preparation

A base level solid ground is required. It should be a minimum of 1.2m x 1.0m, to allow easy access to valves and for maintenance purposes.

Important:

The Nexus filter needs to be equally supported on the three pairs of feet which are located under the vessel. This is to prevent possible distortion when it is full of water.

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The best option for this would be a level 100 mm thick concrete plinth. Although decking, paving ficient as long as the Nexus sits level and is not allowed to deflect under the weight of the water.

slabs or gravel would be suf-

Installation Equipment required or recommended:

Fig. 12

Pump

Raised off

Bottom

Min 12”

Important: you must raise your pump off the pond floor. It is incorrect practice to place a pond pump on the base of any pond as failure in the filteration system. Pipe work or connectors could lead to complete drainage of the pond. Therefore leave a sufficient gap

( min. 12”) for your Koi

Alternative

Return to Pond

Via Waterfall

1. Pond Pump, with a maximum actual flow rate

of no more than your Nexus model allows (see

pages 2 or 3 for specs).

2. Air Pump to power the kaldnes K1 Moving

Bed, see specifications for size of pump

required on page 6.

3. Length of hose or braided pipe (10 mm in

ner diameter) to connect the air pump to the

already positioned/supplied air ring.

Gravity Fed

Systems

In fig 13 you can see a typical set-up of a gravity system.

Reducer

PurgeValve

(x)

Pump

Isolation

Valve (y)

Isolation

Valve

Return to Pond

Pond

Fig. 13

Nexus Eazy Rev. 1.03 page 4

The length of this depends on the distance

between the air pump and the Nexus,

4. Ensure that the air pump is sited well above

water level to prevent water siphoning back

from the filter into the pump due to power cuts

or maintenance shut downs.

5. Pipe work from the unit’s waste valves to the

intended discharge point. This can be rigid

pipe work to a simple flexible hose.

6. A PVC reducer to connect your circulating

pump or pipe to the rubber connector sup

plied with your Nexus ( the size of which will

depend on your choice of pipe work to and

from the pond itself)

7. Care must be taken

when connecting

the waste valves (fig.

14 for the suggested

method) to your

chosen point of dis

charge valve.

Fig. 16 Fig. 17

Fig. 18 Fig. 19

On the 300, the level is maintained with the exit standpipe in the outlet (Fig.16). An overflow grill is cut out of the central chamber wall for added protection(Fig.17). In the 200, a weir plate (Fig.18) sets the Nexus water level and the overflow is built into the wall between the two chambers, with a section moulded at a lower height (Fig.19).

place (Fig. 15 or Fig.16).

Exit plate

Fig. 14

Pump Fed Installation Section 200 + 300

Important: Essential First Action

In any pump fed installation, the first step is to make sure that the water level weir plate/standpipe is in

Chamber A

Chamber B

Chamber C

Safety overflow

Chamber D

Max. Water level

NB. NON UK CUSTOMERS PLEASE NOTE: if you are pump fed, you will receive the weir (200) and standpipe (300) loose and they need to be inserted as shown. The weir is simply dropped ito place. To insert the pipe, the top two bolts and locknuts are removed from the stainless steel outlet plate. Gently pull the plate forward and firmly push the standpipe in place. Replace the nuts and washer. IF THIS PIPE

IS NOT FITTED, THE WATER LEVEL IN THE BIOLOGICAL

CHAMBER WILL BE TOO LOW FOR THE FULL USE OF

THE BIO MEDIA AND THE EAZY !

The unit can be any height above the surface water level, allowing adequate gravity return to the pond

( subject to the maximum performance of your chosen pump) However, care needs to be taken that the top of the Nexus is at least 500 mm higher than the discharge point of the gravity return pipe into the pond ( assuming that the gravity return pipe discharges above the surface of the pond. If the gravity return pipe discharges below the surface of the pond. Please allow 50 mm from the exit of the Nexus to the surface of the pond).

Exit plate Safety overflow

Chamber A

Chamber D

Max. Water level

Fig. 15

THIS MUST BE DONE BEFORE ANY ADDITIONAL INSTAL-

LATION WORK IS CARRIED OUT.

Figure 12 illustrates a typical pump fed installation.

When selecting the position of your Nexus Eazy filter, carefully consider the following factors:

Chamber B

Chamber C

Fig. 20 gravity version

Nexus Eazy Rev. 1.03 page 5

The gravity return pipe work from the exit point of the Nexus to the pond needs to be a minimum of

75 mm (external diameter) and should have no restrictions. Great care should be taken to ensure that no air locks are created within the gravity return pipe work. The pipe work from the pond pump to the inlet of the Nexus will need to be connected to the rubber 50 mm connecting adapter that is fitted to the inlet of the Nexus. A PVC reducer may be required, the size of which depends on the size of the pipe you have chosen to connect the pump to the Nexus. The 75 mm (minimum) gravity return pipe work will need to be connected to the rubber adapter on the exit point of the Nexus. This pipe is then extended / returned to the pond or waterfall as required.

Gravity Fed Installation Section 200 + 300

Once you have positioned the Nexus, please connect the pipe work in accordance with your requirements.

Recommendations:

The rubber 110 mm / 4 " boot supplied will go onto the inlet point, connecting the Nexus to the pond after the recommended isolating valve has been fitted between the bottom drain and your Nexus.

The other rubber boot (supplied) will then fit onto the outlet side of the Nexus to connect the outlet to your circulating pump. A PVC adapter / reducer may be required.

Air Pump Installation Pump + Gravity

Now that you have your Nexus installed, we need to get the Kaldnes installed and the airpump attached to circulate it. This will be circulated permanently in the outer biological chamber when your system is running and for cleaning only in the central chamber when maintaining the Eazy (Fig.21). Your choice of air pump will depend on how much Kaldnes you have in your biological chamber…see table. The size of air pump required will depend on the amount of K1 media used.

Air Pump Size Capacity of K1 media

15/20 litres per min 50 litres of K1 media.

40 litres per min 100 litres of K1 media.

80 litres per min 100-150 litres of K1 media.

The air pump is connected using a pipe (10 mm inner diameter) to the air ring inlet which is positioned on the outside of the Nexus). It is recommended to position the air pump higher than the surface water level in the Nexus to prevent water flowing back into the air pump when it is switched off (see fig. 22).

Fig. 22

Getting Started

Empty your correct amount of K1 into the empty outer biological stage. Fill your Eazy with its appropriate amount (Fig.4). Once the nexus is plumbed in, the pump is fitted and the media is in, it is ready to be started. As with anything, maintenance is an individual and personal thing. Cleaning and maintaining the Nexus will depend on flow rate, feed, stocking, blankert weed etc. A summer pond after a blanket weed treatment will obviously need more care than a December unheated pond with no food fed. Be aware that any movement of the Eazy

K1 will disturb fines back into the pond. The biomedia k1 is zero maintenance. The cleaning regimes for both pump and gravity installations are listed below.

When all the connections have been made the Nexus filter may be filled from the pond and the air pump switched on. The K1 media will not attain neutral buoyancy completely to begin with. Most of the media floats, which is normal. In existing mature pond water the media may start to circulate fully in as little as 2 - 3 hours. In a newly filled and stocked pond this full movement may take up to a week to occur.

Either way a constant and even circulation should be achieved throughout the chamber. (For more information about this please read the Kaldnes K1 media section).

Fig. 21

System running and maintenance :

To achieve optimum water clarity we recommend that the “Eazy” be air backwashed and purged on a regular basis. The frequency of cleaning will depend on the loading of the pond. The longer the filter is left undisturbed the finer the filtration will become. However the filter must be purged regularly to avoid circulation pump starvation on a gravity system or chamber overflow on a pump fed system.

Cleaning Gravity Procedure

1 Stop the circulation pump.

2 Wait a short a period of time so as to allow the

water levels within the Nexus to stabilise.

Nexus Eazy Rev. 1.03 page 6

8 Remove the Isolation pipe

9 Close the airvalve.

10 Open inlet valve.

11 Restart the pond pump.

3 Close off the feed to the

biological chamber by

inserting the isolation pipe

into the centre of the

“Eazy”, ensuring that the

rubber flange engages

within the Nexus centre

spigot (Fig.23).

Fig. 23

4 Close the inlet to the Nexus by

using the inlet slide-plate sup

plied with your Nexus. You

should now have isolated

your “Eazy” from the system

(Fig.24).

5 Open the air valve

until the Kaldnes

in the “Eazy” is boil

ing.

Fig. 24

Kaldnes Moving Bed™ Process

Kaldnes Moving Bed™ process, has been scientifically tried and tested in fish farming and waste treatment for over 10 years.

Illustrated above are the different stages of maturity that will be experience during the first few months.

Developed by Professor Halvard Ødergard at Trondheim

University of Science and Technology the Kaldnes

Moving Bed™ bio film process has been designed specifically to create the most effective environment for the nitrification process to take place. The media is engineered in a wheel shape and is slightly positively buoyant, allowing a small amount of water flow created by adding air to the process) to circulate the media throughout the vessel.

Fig. 25

6 After the “Eazy” has been boiling for a minimum

of one minute, open the valve to waste drain

from the central Nexus chamber.

7 Once central chamber has drained, close waste

valve.

8 Remove the Isolation pipe

9 Close the airvalve.

10 Remove the Nexus inlet slide-plate allowing the

nexus to refill.

11 Restart the circulation pump.

Cleaning Pump Procedure

1 Close single union ball valve on inlet

pressure line (supplied)(Fig.26).

2 Close off the feed to the biological

chamber by inserting the Isolation

pipe into the centre of the “Eazy”,

ensuring that the rubber flange

engages within the Nexus cen

tre spigot.

Fig. 26

3 Re-open inlet valve until the water

level within the Nexus central chamber is level

with the overflow, close inlet valve. It is essential

that this water level is maintained to allow

efficient cleaning.

4 Switch off the pond pump.

5 Open the air valve until the Kaldnes in the “Eazy”

is boiling.

6 After the “Eazy” has been boiling for a minimum

of one minute, open the valve to waste drain

from the central Nexus chamber.

7 Once central chamber has drained, close waste

valve.

Oxygen and food (ammonia and nitrite) gives the bacteria the means to grow, whilst the Kaldnes media provides maximum surface area for the bacteria to colonise and produce bio film. It is this process, which removes harmful ammonia and nitrite from the water. As the

Kaldnes media chaotically circulates within the bio tank, it causes old dead bacteria/bio film on the outside, to be removed making space for new younger heavier feeding bacteria/bio film 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 nitrification conversion process. It also assists in the breakdown of any small particles passing through from the mechanical stage. Therefore, the Kaldnes media maintains both a young biofilm & a maturing bio film providing a more consistent filter performance, whilst improving water quality, encouraging healthier Koi and aiding in reducing green water and blanket weed. Due to chaotic movement of Kaldnes K1 media, the process is self-cleaning and requires no maintenance. This allows the filter to reach optimum effectiveness without the disturbance of periodic maintenance, avoiding unnecessary loss of bacteria within the filter preventing high levels of ammonia and nitrite within the water. The other major benefit of Kaldnes 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 filter design, e.g. the Nexus, whilst providing increased biological efficiency.

How it all works

Maturing the Kaldnes bio-media is important. The maturing process needs monitoring closely to ensure that levels of pH, ammonia and nitrite are within acceptable parameters for your fish. Usually, within 2 - 10 weeks the filter will be effective and the parameters should be within

Nexus Eazy Rev. 1.03 page 7

acceptable levels, depending on temperature and stocking levels.

Bacteria grows faster in warm water. E.g. a pond at 5 Celsius will have a very low bacteria count and a slow growth rate. Therefore temperature is important in reducing the time for a bacteria colony to develop.

Bacteria require food to live otherwise it will starve. The food for bacteria is liquid and solid waste produced by fish. Therefore higher stocking levels will provide more nutrients for the bacteria and help it to establish a colony.

The liquid waste is called ammonia and is the food for the bacteria. Solid waste is broken down to ammonia, but a Koi keeper is better off removing the solid waste through settlement. The fitting of an Answer 325 filter into your Nexus 200 filter will improve this dramatically.

The ammonia reducing bacteria, nitroso-monas, produce an end product called nitrite, which is again potentially toxic to fish. This is controlled through establishing a large nitrobacter population to convert nitrite to the end product, nitrate. The effect of nitrate is less harmful than both ammonia and nitrite. However if nitrate levels are allowed to rise above 50 mg/L pond keepers may start to experience green water & blanket weed. The Kaldnes Moving Bed Process™ is very useful in controlling these levels as it has the highest removal rate of any submerged media on the market.

Nexus Eazy Guarantee

This product comes with a 2 year warranty, which is valid from date of purchase. Proof of purchase will be required.

Any unauthorised repairs, modifications or alterations to this unit will invalidate the warranty.

Evolution Aqua accepts no responsibility or liability due to accident, improper installation or misuse.

Liability is limited to replacement of the defective parts. This guarantee is not transferable. It does not affect your statuary rights.

If there is a warranty issue please contact

Evolution Aqua’s Technical Service department.

Claims for transport damage shall only be recognized if the damage is reported within 24 hours after delivery and confirmed by the carrier.

Evolution Aqua reserve the right to change this product specification without prior notice.

All products designed to ISO 9001 and manufactured to ISO 9000

Patent Information: GB2.293333B; WO/00 61258; PCT/GB01/05533;

PCT/GB01/05549; 0750591;

0575314; 5,543,039; 5,458,779; 6126829; 689246; 2119893; 3183406

Distributed by:

Evolution Aqua Ltd

Evolution House, Kellett Close, Wigan, WN5 0LP

United Kingdom.

UK

Sales: +44 (0) 1942 219 898

Technical: +44 (0) 1942 219872 e-mail: [email protected]

Web: www.evolutionaqua.com

Europe

Germany

Unique Koi

Rauhe Strausse 36, D46459 Rees,

Germany

Sales: +49 (0) 2851 58950

Fax: +49 (0) 2851 589525 e-mail: [email protected]

Web: www.uniquekoi.de

e-mail: [email protected]

Netherlands

Quality Totaal

Bohrweg 22-24, 3208 KR, Spijkenisse,

Netherlands

Sales: +31 (0) 181 628612

Fax: +31 (0) 181 611632 e-mail: [email protected]

Web: www.qualitytotaal.nl

e-mail: [email protected]

USA & Canada

Pond Wise Inc.

429 Shields Rd, Huntsville, Alabama,

35811 USA

Sales: +1 (0) 256 859 0123

Fax: +1 (0) 256 859 0110 e-mail: [email protected]

Web: www.pondwise.com

e-mail: [email protected]

Asia

Max Koi Farm

251 Neo Tiew Cresent, Singapore 7

Singapore

Sales: +65 (0) 6862 6363

Fax: +65 (0) 6862 6262 e-mail: [email protected]

Web: www.makoifarm.sg

e-mail: [email protected]

Australia

Aussie Koi

PO BOX 663, Bulimba 4171, Quensland

Australia

Sales: +61 (0) 417 601 651

Fax: +61(0) 7 3399 8892 e-mail: [email protected]

Web: www.aussiekoi.com

e-mail: [email protected]

South Africa

Cape Koi Aquarium

PO BOX 1312, Brackenfell 7561,

South Africa

Sales: +27 (0) 219889724

Fax: +27(0) 219889595 e-mail: [email protected]

Web: e-mail: [email protected]

Nexus Eazy Rev. 1.03 page 8