Evolution Aqua Nexus Eazy 220+ Pond Filtration System

About This Product

The Evolution Aqua Nexus Eazy 220+ is a premium pond filtration system designed to deliver exceptional mechanical and biological filtration for koi ponds and ornamental water gardens. Featuring advanced K1 Micro mechanical filtration, innovative K+ moving bed biological media, and an easy-to-clean air-assisted filtration system, the Nexus 220+ provides outstanding water clarity and dependable filtration performance for ponds up to 4,800 US gallons.

Building upon Evolution Aqua’s award-winning Nexus filtration technology, the Nexus Eazy 220+ combines two essential filtration processes within one integrated system. The inner Eazy mechanical filtration chamber captures suspended debris, fish waste, and organic particles, while the outer biological chamber provides an ideal environment for beneficial bacteria that help break down harmful ammonia and nitrite.

The advanced Eazy mechanical filtration system incorporates 18 liters of K1 Micro filter media inside a specially designed stainless steel chamber. As pond water enters the filter, larger debris settles within the inner chamber before passing through the static K1 Micro media, where finer suspended particles are captured. This process helps maintain excellent water clarity while reducing the amount of waste entering the biological filtration stage.

The outer chamber contains 50 liters of Evolution Aqua K+Media, a specialized biological filtration medium designed to encourage the development of beneficial bacterial colonies. Constant movement generated by an external air pump keeps the media circulating in oxygen-rich water, supporting efficient biological filtration and the conversion of harmful ammonia and nitrite into less toxic nitrate.

One of the Nexus 220+’s greatest advantages is its convenient cleaning system. Instead of relying on disposable cartridges or traditional filter pads, the Nexus uses air agitation to dislodge accumulated debris from the Eazy mechanical media. The loosened waste is then discharged through a dedicated drain, making routine maintenance straightforward and efficient.

The Nexus 220+ is also Automatic Cleaning System ready, featuring factory-installed mounting provisions that simplify upgrading to Evolution Aqua’s optional automatic cleaning system. This upgrade allows programmable cleaning cycles, reducing the need for manual maintenance.

Designed for both gravity-fed and pump-fed installations, the Nexus 220+ provides flexible installation options for new pond construction and existing filtration upgrades. With a maximum flow rate of 2,640 US gallons per hour and an expandable biological media capacity, this filtration system is well suited to koi ponds requiring efficient waste removal and dependable water quality.

Whether you’re building a new koi pond, upgrading an existing filtration system, or seeking a low-maintenance solution for ornamental pond filtration, the Evolution Aqua Nexus Eazy 220+ offers exceptional performance, reliable biological filtration, and convenient maintenance.

Features:

• Advanced mechanical and biological filtration combines two essential filtration processes in one integrated pond filtration system.
• Designed for ponds up to 4,800 US gallons provides substantial filtration capacity for koi ponds and ornamental water gardens.
• Maximum flow rate of 2,640 US GPH supports effective pond water circulation and filtration.
• Innovative Eazy mechanical filtration captures suspended particles, fish waste, and organic debris using static K1 Micro media.
• 18 liters of K1 Micro media included provides efficient mechanical filtration and helps capture fine suspended particles.
• 50 liters of K+ biological media included offers specialized surface area for beneficial bacterial colonies.
• Moving bed biological filtration keeps filtration media circulating in oxygen-rich water for effective ammonia and nitrite processing.
• Expandable biological media capacity accommodates up to 150 liters of K+Media in the outer chamber.
• Vortex-style settlement chamber allows heavier waste particles to settle before reaching the mechanical filtration media.
• Air-assisted cleaning system agitates the Eazy mechanical media to release accumulated debris during maintenance.
• Convenient waste discharge allows trapped debris to be flushed from the filter without manually washing filter pads.
• Automatic cleaning upgrade ready includes factory-installed provisions for Evolution Aqua’s optional Nexus Automatic Cleaning System.
• Gravity-fed installation compatibility supports systems using bottom drains and gravity water supply.
• Pump-fed installation compatibility accommodates systems where a water pump delivers pond water directly to the filter.
• Reusable filtration media eliminates the need for disposable mechanical filter cartridges.
• Large 135-gallon internal water capacity provides substantial filtration volume.
• Excellent for koi ponds with demanding mechanical and biological filtration requirements.
• Designed for long-term pond maintenance with accessible components and straightforward cleaning procedures.

Specifications:

• Brand: Evolution Aqua
• Product name: Nexus Eazy 220+
• Series: Nexus+
• Product type: Integrated mechanical and biological pond filtration system
• Filtration method: Mechanical and moving bed biological
• Maximum pond capacity: 4,800 US gallons (18,000 liters)
• Maximum flow rate: 2,640 US GPH (10,000 LPH)
• Recommended flow rate: 1,585 US GPH (6,000 LPH)
• Total filter water capacity: 510 liters (approximately 135 US gallons)
• Inner mechanical chamber volume: 105 liters (approximately 28 US gallons)
• Outer biological chamber volume: 405 liters (approximately 107 US gallons)
• Mechanical filtration media: K1 Micro
• Included mechanical media: 18 liters
• Biological filtration media: K+Media
• Included biological media: 50 liters
• Maximum biological media capacity: 150 liters
• Additional biological media capacity: Up to 100 liters
• Biological filtration type: Aerated moving bed
• Mechanical filter design: Stainless steel Eazy chamber
• Prefiltration: Vortex settlement
• Cleaning method: Air-assisted agitation and waste flushing
• Automatic cleaning compatibility: Yes, optional upgrade required
• Recommended air pump: Evolution Aqua Air Pump 75 or larger, depending on media volume
• Installation configurations: Gravity-fed or pump-fed
• Pond compatibility: Freshwater koi ponds and ornamental water gardens
• Replacement filter cartridges: Not required
• Water pump: Required; confirm whether included in selected package
• Air pump: Required; confirm whether included in selected package
• Recommended application: Koi ponds, ornamental water gardens, and combined mechanical and biological pond filtration systems

Recommended Air Pump Requirements:

The Nexus Eazy 220+ requires continuous aeration in the biological chamber to keep the K+Media circulating and supply oxygen to beneficial bacteria.

K+Media in Biological Chamber	Recommended Air Pump
50–75 liters	Evolution Aqua Air Pump 75
75–100 liters	Evolution Aqua Air Pump 95
100–150 liters	Evolution Aqua Air Pump 130

When adding biological filtration media, ensure the selected air pump provides enough airflow to keep the moving bed circulating properly.

Installation and Maintenance Recommendations:

Install the Nexus Eazy 220+ on a solid, level surface capable of safely supporting the filter when completely filled with water. Allow adequate space around the filter for plumbing connections, cleaning, and routine maintenance.

Gravity-Fed Installation

In a gravity-fed configuration, pond water enters the Nexus through a suitable gravity supply line, commonly connected to a bottom drain.

The water passes through the mechanical and biological filtration chambers before a circulation pump returns it to the pond.

The Nexus operating water level must be correctly positioned relative to the pond water level for proper gravity-fed operation.

Pump-Fed Installation

In a pump-fed configuration, a water pump supplies pond water directly into the Nexus filter.

After passing through the filtration chambers, the cleaned water returns to the pond by gravity.

The inlet and outlet fittings must be configured according to Evolution Aqua’s instructions for pump-fed operation.

Cleaning and Maintenance

The Nexus Eazy 220+ uses air-assisted cleaning to remove trapped debris from the mechanical filtration chamber.

1. Isolate the filter from normal pond circulation according to its installation configuration.
2. Redirect the air supply from the biological chamber to the Eazy mechanical chamber using the appropriate air valves.
3. Allow the air to agitate the K1 Micro media, releasing trapped debris and organic waste.
4. Open the waste valve to discharge dirty water from the mechanical chamber.
5. Repeat the cleaning process as necessary until the discharged water becomes sufficiently clear.
6. Return the valves and air supply to their normal operating positions and restart filtration.

During normal operation, the outer biological chamber should remain continuously aerated to maintain movement of the K+Media and support beneficial bacterial activity.

Avoid unnecessarily cleaning or replacing the biological media, as this can disturb the beneficial bacteria responsible for processing ammonia and nitrite.

Important Product Information:

The Nexus Eazy 220+ is automatic-cleaning upgrade ready but does not include the automatic cleaning system as standard. The optional Evolution Aqua Automatic Cleaning System must be purchased separately.

The filtration system requires an appropriately sized water pump and air pump. Confirm the accessories included with your selected package before installation.

The manufacturer’s maximum pond rating of 4,800 US gallons is a capacity guideline rather than a guarantee for every pond. Actual filtration requirements depend on fish population, feeding rates, pond turnover, and water quality conditions.

For heavily stocked koi ponds, additional biological media or supplementary filtration may be beneficial.

Recommended application: A professional-quality mechanical and biological filtration system ideal for koi ponds and ornamental water gardens requiring excellent water clarity, efficient ammonia and nitrite processing, expandable biological filtration capacity, and convenient air-assisted cleaning.