Evolution Aqua Nexus Eazy 320+ Pond Filtration System

About This Product

The Evolution Aqua Nexus Eazy 320+ is a premium, high-capacity pond filtration system designed to deliver exceptional mechanical and biological filtration for large koi ponds and ornamental water gardens. Featuring advanced K1 Micro mechanical filtration, innovative K+ moving bed biological media, and a convenient air-assisted cleaning system, the Nexus 320+ provides outstanding water clarity and dependable filtration performance for ponds up to 9,000 US gallons.

Building upon Evolution Aqua’s award-winning Nexus filtration technology, the Nexus 320+ combines two essential filtration processes in one powerful, 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 20 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 vortex chamber before passing through the static K1 Micro media, where finer particles are trapped. This process helps maintain exceptional water clarity while reducing the amount of waste reaching the biological filtration stage.

The outer chamber contains 100 liters of Evolution Aqua K+Media, an advanced biological filtration medium engineered to encourage the development of beneficial bacterial colonies. Constant movement generated by an external air pump keeps the media circulating, providing oxygen-rich conditions that support efficient biological filtration and help maintain healthy pond water.

One of the Nexus 320+’s greatest advantages is its convenient cleaning system. Rather than requiring traditional filter pads or messy manual cleaning, the Nexus uses air agitation to dislodge accumulated debris from the Eazy mechanical media. Waste is then discharged through the filter’s dedicated drain, making routine maintenance quick and straightforward.

The Nexus 320+ 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 intervention and making pond maintenance even more convenient.

Designed for both gravity-fed and pump-fed installations, the Nexus 320+ offers installation flexibility for new pond construction and existing filtration upgrades. With a maximum flow rate of 3,431 US gallons per hour, this filtration system is well suited to substantial koi ponds with demanding mechanical and biological filtration requirements.

Whether you’re constructing a new koi pond, upgrading an aging filtration system, or seeking a high-capacity solution for heavily stocked ornamental ponds, the Evolution Aqua Nexus Eazy 320+ offers exceptional filtration performance, expandable biological capacity, and easy maintenance.

Features:

• Advanced mechanical and biological filtration combines two essential filtration stages in one integrated pond filtration system.
• Designed for ponds up to 9,000 US gallons provides high-capacity filtration for large koi ponds and ornamental water gardens.
• Powerful water circulation capacity supports flow rates up to 3,431 US gallons per hour.
• Innovative Eazy mechanical filtration removes suspended particles, fish waste, and organic debris using static K1 Micro media.
• 20 liters of K1 Micro media included provides efficient mechanical filtration and captures fine suspended particles.
• 100 liters of K+ biological media included offers an advanced surface structure designed to support beneficial bacterial colonies.
• Moving bed biological filtration keeps biological media circulating in oxygen-rich water for efficient ammonia and nitrite processing.
• Expandable biological media capacity accommodates up to 300 liters of K+Media in the outer filtration chamber.
• Vortex-style mechanical prefiltration allows heavier debris to settle before water passes through the Eazy filtration media.
• Air-assisted cleaning system agitates the mechanical filter media to release accumulated debris during maintenance.
• Convenient waste discharge allows trapped debris to be removed without manually washing traditional filter pads.
• Automatic cleaning upgrade ready features factory-installed provisions for an optional Nexus Automatic Cleaning System.
• Gravity-fed installation compatibility supports pond systems where water flows from the pond into the filter by gravity.
• Pump-fed installation compatibility accommodates configurations where a water pump delivers pond water into the filtration unit.
• Improved biological filter maturation through Evolution Aqua’s advanced K+Media design.
• No disposable filter cartridges required uses reusable biological and mechanical filtration media.
• Large filtration capacity provides substantial water volume and media contact time for effective pond filtration.
• Ideal for koi ponds with high biological loads and demanding water quality requirements.

Specifications:

• Brand: Evolution Aqua
• Product name: Nexus Eazy 320+
• Series: Nexus+
• Product type: Integrated mechanical and biological pond filtration system
• Filtration method: Mechanical and moving bed biological
• Maximum pond capacity: 9,000 US gallons (34,000 liters)
• Maximum flow rate: 3,431 US GPH (13,000 LPH)
• Recommended flow rate: Approximately 2,905 US GPH (11,000 LPH)
• Total filter water capacity: 840 liters (approximately 222 US gallons)
• Inner mechanical chamber volume: 205 liters (approximately 54 US gallons)
• Outer biological chamber volume: 635 liters (approximately 168 US gallons)
• Mechanical filtration media: K1 Micro
• Included mechanical media: 20 liters
• Biological filtration media: K+Media
• Included biological media: 100 liters
• Maximum biological media capacity: 300 liters
• Biological filtration type: Aerated moving bed
• Mechanical filter design: Stainless steel Eazy chamber
• Prefiltration: Vortex settlement chamber
• Cleaning method: Air-assisted agitation and waste flushing
• Automatic cleaning compatibility: Yes, optional upgrade kit required
• Recommended air pump: Evolution Aqua Air Pump 95 or larger
• Installation configurations: Gravity-fed or pump-fed
• Minimum installation base: 1.2m × 1.0m, solid and level
• Pond compatibility: Freshwater koi ponds and ornamental water gardens
• Replacement filter cartridges: Not required
• Air pump included: Not specified as included with standard filter
• Water pump included: Not specified as included with standard filter
• Recommended application: Large koi ponds, heavily stocked ornamental ponds, and advanced biological pond filtration systems

Recommended Air Pump Requirements:

The Nexus 320+ requires continuous aeration in the biological chamber to keep the K+Media moving and provide oxygen for beneficial bacteria.

K+Media in Biological Chamber	Recommended Air Pump
100 liters (standard)	Evolution Aqua Air Pump 95
100–150 liters	Evolution Aqua Air Pump 130
150–300 liters	Evolution Aqua Air Pump 150

When adding additional biological media, ensure the air pump provides sufficient airflow to keep the entire media bed moving effectively.

Installation and Maintenance Recommendations:

Install the Nexus Eazy 320+ on a solid, completely level base capable of supporting the weight of the filter when filled with water. Evolution Aqua specifies a minimum installation base measuring 1.2 meters by 1.0 meter.

Gravity-Fed Installation

In a gravity-fed configuration, pond water flows through a suitable bottom drain or gravity supply line into the Nexus filter. A circulation pump installed after the filter returns the cleaned water to the pond.

The operating water level in the Nexus must correspond to the pond’s water level for the system to function correctly.

Pump-Fed Installation

In a pump-fed configuration, a pond pump supplies water directly to the Nexus filter. The filtered water then 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 320+ uses an air-assisted cleaning procedure that eliminates the need to manually remove and wash conventional filter pads.

1. Isolate the filter from normal pond circulation according to the installation configuration.
2. Direct the air supply to the Eazy mechanical chamber using the appropriate air valves.
3. Allow the air to agitate the K1 Micro media, loosening accumulated debris and organic waste.
4. Open the waste valve to discharge the dirty water and suspended debris.
5. Repeat the cleaning process if necessary until the discharged water becomes sufficiently clear.
6. Restore the valves and air supply to their normal operating positions and restart pond circulation.

The outer moving bed biological chamber should remain continuously aerated during normal filtration operation.

Avoid unnecessarily cleaning or replacing the K+ biological media, as it supports established beneficial bacteria essential for processing ammonia and nitrite.

Important Product Information:

The Nexus Eazy 320+ is supplied ready for an optional automatic cleaning upgrade but does not include the automatic cleaning system as standard.

The filtration system requires an appropriately sized water pump and air pump for normal operation. Confirm which accessories are included with the particular package before purchasing.

The manufacturer’s maximum pond rating of 9,000 US gallons represents an upper capacity guideline. Actual filtration requirements depend on koi population, fish size, feeding rates, water turnover, and overall pond conditions.

For heavily stocked koi ponds, additional filtration capacity or a lower operating pond volume may be appropriate.

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