The Evolution Aqua Nexus is one of the most respected filtration systems in the koi pond world. Designed to handle the heavy biological demands created by koi, the Nexus combines innovative engineering with practical usability. This guide explains how the Evolution Aqua Nexus works, how to choose the right model, and how to get the best performance from your system, whether you are new to koi keeping or upgrading an existing pond.
What Is the Evolution Aqua Nexus?
The Evolution Aqua Nexus is a combined mechanical and biological pond filter that uses moving bed technology. Instead of relying on sponges or static chambers alone, the Nexus employs K1 and K1 Micro media that move continuously inside the filter. This motion keeps the media clean, oxygenated, and highly efficient at breaking down harmful waste.
The filter is designed specifically for koi ponds, where water quality must remain stable even with heavy feeding and large fish.
Understanding the Nexus Filtration Process
The Nexus filter operates in two main stages:
Stage One: Mechanical Filtration
Water first enters the outer chamber, where solid waste is trapped using static K1 Micro media. This prevents debris from reaching the biological stage and keeps the system running efficiently.
Stage Two: Biological Filtration
Cleaned water then flows into the inner chamber, where K1 media is constantly circulated by air. Beneficial bacteria colonise the moving media and break down ammonia and nitrite into less harmful nitrate.
This two-stage process delivers clear water and a stable biological environment for koi.
Choosing the Right Nexus Model
Evolution Aqua offers different Nexus models to suit various pond sizes and stocking levels. When choosing a model, consider:
- Total pond volume
- Number and size of koi
- Feeding intensity
- Installation method (pump-fed or gravity-fed)
For heavily stocked ponds, it is recommended to choose a larger model to ensure adequate filtration capacity and long-term performance.
Pump-Fed vs Gravity-Fed Installation
The Nexus can be installed in two ways:
- Pump-fed systems use a submersible or external pump to push water into the filter. This setup is common and easy to install.
- Gravity-fed systems allow water to flow naturally into the filter from a bottom drain, with a pump returning water to the pond. This method is often preferred for larger koi ponds.
Both options are effective when installed correctly.
Maintenance and Cleaning Guide
One of the Nexus’s biggest advantages is its ease of maintenance. Cleaning typically involves:
- Isolating the filter
- Agitating the static media using air
- Opening the waste valve to flush debris
- Returning the system to normal operation
The biological chamber remains untouched during cleaning, protecting beneficial bacteria and ensuring stable filtration.
Regular maintenance keeps the Nexus running at peak efficiency.
Tips for Best Performance
To get the most from your Evolution Aqua Nexus:
- Clean the mechanical stage regularly
- Ensure air pumps and airlines are functioning properly
- Maintain consistent water levels
- Avoid overfeeding
- Monitor water parameters regularly
These simple steps help maximise clarity and fish health.
Conclusion
This Evolution Aqua Nexus guide highlights why the system remains a top choice for koi pond filtration. Its moving bed technology, simple maintenance, and strong biological performance make it ideal for maintaining clear water and healthy fish. With correct installation and regular care, the Nexus provides reliable, long-term filtration for ponds of all sizes.
