Evolution Aqua Pond Filters from Utopia Koi

Evolution Aqua Nexus Eazy 220 & 320

Evolution Aqua Nexus Eazy 220 & 320 Explained

The Evolution Aqua Nexus 320 and 220 filters really are a fantastic all in one mechanical and biological pond filter that offer superb results. As the name suggests they are easy to install and easy to use whilst helping to create the perfect water conditions for your pond.

How do Nexus Eazy 220 and 320 work?

Water from the pond enters the nexus 220 or 320 via the inlet into the inner chamber which works as a vortex allowing larger waste solids in the water to settle and drop out of suspension.

The water then passes through the grills in the stainless steel Eazy filter located in the centre of the filter which is a static non moving chamber where the finer particles are removed in this second mechanical stage of filtration, thanks to the K1 Micro filter media.

The water is then mechanically clean and passes from the inside of the Nexus 220 or 320 filter to the outside chamber where the K1 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 protected surface area of each piece of the K1 Media. These bacteria convert Ammonia and Nitrite into harmless Nitrate.

Water then passes through the exit grill into the outlet, returning back to the pond.

Evolution Aqua Nexus 320 & 220
The Eazy Filter

The Eazy is a stainless steel vessel containing the K1 Micro Media (20 litres in the Nexus 320 and 18 litres in the 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.

Biological Filtration – K1 Moving Bed

The outer chamber of the Nexus contains the moving bed of K1 Media.

100 litres of K1 Media is supplied with the Nexus 320 with the option to add an extra 200 litres of K1 Media should it be needed.

The Nexus 220 is supplied with 50 litres of K1 Media, with the option to add an extra 100 litres of K1 Media if needed.

The outer chamber is the final stage of the filter where the biological treatment of the water takes place. 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 dependent on feed rates and the type of food used.

Air Pump Requirements

You can increase the biological capacity of your Nexus by adding 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 table for recommended size of air pump).

For Nexus filtration systems with the standard supplied media It is recommend that an Airtech 75 air pump is used to power the moving bed in a Nexus 220 and an Airtech 95 air pump for a Nexus 320.

Total amount of  K1 Media in the outer chamber Recommended Evolution Aqua Air Pump
50 – 75 Litres Air Pump 75
75 -100 Litres Air Pump 95
100 – 150 Litres Air Pump 130
150 – 300 Litres Air Pump 150
  • Evolution Aqua Nexus 220 & 320

    £995.00£1,260.00

    Evolution Aqua Nexus 320 and 220 are an award winning new generation range of filters that cleverly combine mechanical and biological filtration into one advanced filter system, whilst being incredibly easy to clean and simple to install.

    Both the Nexus 220 and 320 feature a re-designed Eazy mechanical filter which now utilises K1 Micro filter media, in the static bed, to deliver improved levels of mechanical filtration taking out even the smallest waste particles giving a very good level of water clarity.

    Inside the main Nexus filter chamber is a massive moving bed of the award winning K1 Media delivering outstanding levels of biological filtration.

    Together this combination of  mechanical filtration and biological filter media works to deliver water the is visibly health with good clarity and oxygen content.

    The Evolution Aqua Nexus 320 and 220 filtration systems can be installed in a pump set up or gravity fed setups depending on your pond configuration. The Nexus 220 is suitable for ponds up to 18,000 litres (4,000 gallons) while the Nexus 320 can be installed on ponds up to 34,000 litres (7,500 gallons).

    View Nexus Eazy 220 Manual

    View Nexus Eazy 320 Manual

    View Nexus Eazy 220 & 320 Dimensions

    View Nexus Eazy 220 & 320 Cleaning Instructions

    view product video
    NEXUS EAZY 220 NEXUS EAZY 320
    MAX. POND SIZE 18,000 Litres
    4,000 UK Gallons
    4,8000 US Gallons
    34,000 Litres
    7,500 UK Gallons
    9,0000 US Gallons
    MAX. FLOW RATE 10,000 Litres per hour
    2,200 UK Gallons per hour
    2,640 US Gallons per hour
    13,000 Litres per hour
    2,859 UK Gallons per hour
    3,431 US Gallons per hour
    K1 MICRO SUPPLIED 18 Litres
    (inside Eazy)
    20 Litres
    (inside Eazy)
    K1 MEDIA SUPPLIED 50 Litres
    (for Bio Chamber)
    100 Litres
    (for Bio Chamber)
    MAX. CAPACITY FOR K1 MEDIA 150 Litres 300 Litres
    RECOMMENDED AIRPUMP AirPump 75 or above* AirPump 95 or above*
    VOL. OF WATER IN NEXUS 510 Litres 840 Litres
    VOL. OF WATER IN INNER CHAMBER 105 Litres 205 Litres
    VOL. OF WATER IN OUTER CHAMBER 405 Litres 635 Litres

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  • Evolution Aqua Nexus 220 & 320 LID

    £114.95

    Evolution Aqua Nexus 220 & 320 LID

    Some customers choose to utilise a LID on their Nexus 220 or 320 providing some noise suppression and keeping the media in a darkened environment and free from environmental pollutants such as leaves.

    The LID is moulded from UV resistant durable plastic and is designed to fit perfectly with either your Evolution Aqua Nexus 220 or Nexus 320.

    The use of a LID can also helping reduce the humidity of your filter house locking the water inside the filter and keeping your filter house clean and dry.

    The Nexus 220 & 320 filtration systems are supplied without the LID so if you require a LID it needs to be ordered as part of the filter package offered by Utopia Koi or purchased separately

    Utopia Koi has one of the largest selections of pond equipment for sale in the UK!

    • Everything we sell is offered for sale at prices representing fantastic value for money.
    • Everything we sell is delivered quickly.
    • Every product we sell is displayed  impeccably on our safe, secure website
    • Everything we do makes Utopia Koi the place to shop for all things Pond & Koi!

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  • Evolution Aqua Nexus 220 & 320 Waste Kit

    £19.95

    The Evolution Aqua Nexus 220 & 320 Waste Kit is often forgotten but it will save lots of time and effort when installing your new Nexus filter.

    The wast kit includes all the required pre cut and easy to assemble pipework to connect the 1.5” and 3/4” waste ball vales on the Nexus filter system to waste enabling you to drain the inner or outer chamber of the nexus independently, quickly and with ease.

    Take all the hassle away from connecting your Evolution Aqua Nexus 220 or 320 to waste with this pre assembled ki

    Utopia Koi has one of the largest selections of pond equipment for sale in the UK!

    • Everything we sell is offered for sale at prices representing fantastic value for money.
    • Everything we sell is delivered quickly.
    • Every product we sell is displayed  impeccably on our safe, secure website.
    • Everything we do makes Utopia Koi the place to shop for all things Pond & Koi!

    £19.95

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Pond liner calculator

Use our simple Pond Liner Calculator to estimate the liner and/or underlay size required for your pond.

The result allows for an overlay either side of 30cms. You may wnat to increase or decrease this value depending on your pnd installation.

If you're not sure on what size you need then contact us and we can help.

Measurements are entered in meters. As an example if your pond is 254cm deep at its deepest enter 2.54.

The liner dimensions for your pond including a 30cm over lap are:

Liner length:

Liner width:

An interesting fact for you. The water volume of your pond will be:

Litres:

UK gallons:

Rectangle Pond Volume calculator

Pond Diagram

Measure the length of your pond, the width of your pond and the depth of your pond in meters and enter the measurements into the Utopia Koi easy to use pond volume calculator. This will give the volume in litres.

If you're not sure on what size you need then contact us and we can help.

Measurements are to be entered in meters, for example: 543cm would be entered as 5.43.

The water volume of your pond will be:

Volume in Litres:

Volume in UK gallons:

Circular Pond Volume calculator

Radius Diagram

Measure the diameter of your pond (the distance across the pond at its centre) then divide the diameter in two to get the radius of your pond.

Now measure the depth of your pond and enter the measurements into the Utopia Koi easy to use circular pond volume calculator.

If you're not sure on what size you need then contact us and we can help.

Measurements are to be entered in meters, for example: 543cm would be entered as 5.43.

The water volume of your pond will be:

Volume in Litres:

Volume in UK gallons:

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