Description
The Evolution Aqua Nexus is one of the most trusted koi pond filtration systems in the UK and Europe, designed to deliver high-performance mechanical and biological filtration in a single unit.
Its unique design separates waste solids in the outer chamber while using a moving bed of K1 media in the inner chamber to support massive colonies of beneficial bacteria.
This combination creates a stable, low-maintenance system capable of handling high fish loads and heavy feeding regimes common in koi ponds.
Gravity Fed Nexus Systems
Gravity fed Nexus installations are widely considered the most efficient and stable setup for koi ponds.
How it works:
Water flows by gravity from a bottom drain or skimmer directly into the Nexus filter.
Benefits:
✔ Best water quality stability
✔ Ideal for new koi pond builds
✔ Constant flow through filtration
✔ Reduced pump strain
✔ More efficient solids removal
Typical setup:
Bottom drain → Settlement line → Nexus inlet → Pump chamber → Return to pond
Pump Fed Nexus Systems
Pump fed Nexus systems are ideal for retro-fit ponds or where gravity installation is not possible.
How it works:
A pump pushes water directly into the Nexus filter.
Benefits:
✔ Easier installation
✔ Ideal for existing ponds
✔ No need for deep pipework
✔ Flexible positioning
✔ Lower build cost
Typical setup:
Pump → Nexus inlet → Filtration chambers → Return to pond (gravity or pump return)
Key Features
✔ Mechanical + biological filtration in one unit
✔ Patented Eazy cleaning system
✔ K1 moving bed biological chamber
✔ Extremely low maintenance design
✔ High flow handling capability
✔ Suitable for koi and ornamental ponds
✔ Gravity fed or pump fed options
✔ Stable biological performance
✔ Handles heavy fish stocking
✔ Long term reliable operation
Evolution Aqua Nexus Technical Specifications
| Model | Pond Size | Flow Rate | Filtration Type | Media Volume | Best Use |
|---|---|---|---|---|---|
| Nexus Eazy 220+ | Up to 20,000L | 8,000–10,000 LPH | Mechanical + Bio | Standard K1 chamber | Small–medium koi ponds |
| Nexus Eazy 320 | Up to 35,000L | 12,000–15,000 LPH | Mechanical + Bio | Large K1 chamber | Medium koi ponds |
| Nexus 320+ | 35,000L+ | 15,000–20,000 LPH | High capacity system | Expanded bio volume | Large koi ponds |
Actual performance depends on stocking levels, feeding rate, and system design.
How the Nexus System Works
1. Mechanical Filtration (Eazy Chamber)
Water enters the outer chamber where solids are trapped and separated from the system.
2. Biological Filtration (Moving Bed Chamber)
Water flows into the inner chamber containing moving K1 media where beneficial bacteria break down ammonia and nitrite.
This ensures stable water parameters and excellent clarity with minimal maintenance.
Recommended Applications
- Koi ponds
- High stocking density systems
- Garden ponds
- Commercial koi installations
- Drum filter pre-filtration systems
- Advanced biological filtration systems
Installation Options
Gravity Fed Installations
- Bottom drain fed systems
- Skimmer integration possible
- Best for high performance koi ponds
Pump Fed Installations
- Retrofit pond systems
- Above ground installations
- Flexible placement options
Maintenance
The Nexus system is designed for simple maintenance:
- Eazy chamber cleaned via air agitation
- Waste removed through purge system
- Biological chamber remains stable and undisturbed
- Minimal disruption to bacterial colony
Box Contents
- Evolution Aqua Nexus filter body
- Eazy cleaning chamber
- Internal pipework
- Lid assembly
- K1 media (model dependent)
- Instruction manual
Why Choose Evolution Aqua Nexus?
The Nexus system remains one of the most proven koi filtration systems due to its simplicity, reliability and biological stability.
It is widely used in both domestic and professional koi pond installations due to its ability to maintain clear, stable water conditions with minimal effort.
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