Evolution Aqua nexus™ Filter Systems

Evolution Aqua SKU: NEXEAZ220

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$2,249.99

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How the nexus® filter works:

1.  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.

2.  Water then passes through the grills in the stainless steel "Eazy" filter, where the finer particles are removed at the mechanical stage of filtration, thanks to the static bed of their award winning K1 Micro® 

3. The mechanically clean water then passes to the outside chamber of the nexus where the K1 Media moving bed is located for biological treatment prior to being returned to the pond.

4.  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 less harmful Nitrate.

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

Nexus in use
  • Improved EAZY filter with a more efficient slot pattern.
  • New K1Micro in EAZY for mechanical filtration
  • K1 Media in outer chamber for biological filtration
  • Easy to install, simple to maintain
  • Install on a pump-fed or gravity-fed set-up
  • Manufactured ready for easy upgrade to Automatic System
Two Models:
nexus220
Max Pond Size: 4,800 US gallons
Max Flow Rate: 2,640 US gallons/hr
Volume of water in nexus: 135 US gallons
Amount of K1 Micro supplied in EAZY filter: 18 Liters of K1 Micro (Inner Chamber)
Amount of K+ Media supplied in in Bio Chamber: 50 Liters of K+ Media (Outer Chamber)  -  PLEASE NOTE: The amount of media in the outer chamber can be increased up to 150 Liters of K+ TOTAL to the outer chamber for heavy fish loads.  On a new setup, if the media is increased, the media will take more time to mature as there is more surface area for the bacteria to colonize.

 
nexus320
Max Pond Size: 9,000 US gallons
Max Flow Rate: 3,431 US gallons/hr
Volume of water in nexus: 222 US gallons
Amount of K1 Micro supplied in EAZY filter: 20 Liters of K1 Micro (Inner Chamber)
Amount of K+ Media supplied in Bio Chamber: 100 Liters of K+ Media (Outer Chamber) - PLEASE NOTE:  The amount of media in the outer chamber can be increased up to 300 Liters of K+ TOTAL to the outer chamber for heavy fish loads.  On a new setup, if the media is increased, the media will take more time to mature as there is more surface area for the bacteria to colonize.
Max capacity for K+ Media:  300 Liters of K+ Media
 
Nexus Dimensions
Gravity Fed Install
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.
 
Nexus Gravity Fed Illustration
Pump-Fed Install
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).
Nexus Pump Fed Illustration

Improved Mechanical Filtration

The new design of the Eazy enables the Nexus to capture solids more effectively than before. K1 Micro is used inside the re-designed Eazy helping to deliver improved capture of fine particles, delivering unrivalled mechanical filtration.

Improved Flow

The new Eazy features an improved pattern of slots in the stainless steel body which makes the filter more efficient. Water can pass through the Eazy through all sides and from below, much more effectively than before. This feature combined with the use of K1 Micro makes for improved flow rates through the entire mechanical filter stage.

Dramatically Improved Clarity

The Nexus 320 and 220 filter systems use two types of filter media to deliver optimum levels of clarity in your pond. K1 Micro is used in the Eazy to improve mechanical filtration while the tried and tested K1 Media is used in the moving bed outer chamber, delivering the biological filtration.

Easy To Clean And Maintain

A key feature of all Nexus filtration systems is the sheer ease of maintenance. This still remains the case with the new Nexus 220 and 320 systems. The Eazy is simply cleaned by using a combination of the cleaning pipe, air valves and ball valves fitted to the Nexus, meaning you don’t need to get your hands dirty. The clear lid fitted to the Eazy also makes it easy to visual inspect the K1 Micro media.

Better Solids Handling

Inside the centre mechanical stage of the Nexus, there is a much larger area for solid waste to be captured and to settle. This area can then be cleaned even easier than before ensuring the filter does not clog up with unnecessary amounts of waste.

Removable Eazy

All Eazy filters used in the Nexus 320 / 220 series can be removed if needed with the K1 Micro in place. This added feature is ideal when undertaking further maintenance.

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.

Air Pump Requirements

You can increase the biological capacity of your Nexus by adding additional K1 Media into the outer chamber up to the maximum capacity.  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 below.

Evolution Aqua Media Amount vs. Air Pump Size

PLEASE NOTE:  THIS IS A FREIGHT ITEM.  A VALID CONTACT NUMBER IS NEEDED TO SCHEDULE THE DELIVERY.  INSPECT THE ITEM FOR DAMAGE BEFORE SIGNING FOR ACCEPTANCE.

 

PLEASE NOTE:  LID IS SOLD SEPARATELY.

More Information that may be helpful

For older models, the 300 and 310 contained 40 liters of K1 in the Eazy, and 30 liters for the 200 and 210.

Don’t change the amount of media in the Eazy as this affects particle capture, and ease of cleaning. The amount of media in the outer chamber can be increased however by up to 150 liters in total in the 220 and 300 liters in the 320 models.

Only increase the amount of media in the outer chambers for heavy stocking and heavy feeding. Note that if the total volume of media is increased in a newly set up filter it will take longer to mature, as there is more surface area for bacteria to colonize and the biofilm will be more thinly spread.

 

Related Products

nexus220 Owner's Manual

nexus320 Owner's Manual

Airtech Air Pumps

Optional Covers/Lids

nexus™ Automatic Upgrade

Replacement Nexus Parts

Questions & Answers

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  • What size pump do you recommend for the 220?

    Slower is better for fine removal and clearer water. Aim to turn over your pond volume every two to three hours.

    Maximum recommended flow on the 220 is 10,000 lph (2,640 gph) and the 320 is 13,000 lph, (3,432 gph) however suggested flow rates are lower.  The Evolution Aqua Varipump range are adjustable, and consume less energy when you turn them down.

  • Why is my nexus overflowing in the center area? It seems to be clogged.

    If it is the entire center area where the Eazy is located, then you have a clog or all the media is clogged. The Eazy (whole stainless piece with the K1 Micro media in it) lifts out. This is helpful to know when taking it apart to clean it. You might not have been cleaning it enough if you have had an algae problem.