The Evolution Aqua Nexus is one of the most advanced and reliable koi pond filtration systems available today. Designed with simplicity, efficiency, and long-term performance in mind, the Nexus has become a favourite among koi keepers who want crystal-clear water and stable biological filtration. This guide provides a full overview of how the Nexus works, why it’s so effective, how to size it correctly, and how to maintain it for the best results.
Understanding the Nexus Filtration Process
The Evolution Aqua Nexus uses a unique two-stage filtration system that combines mechanical and biological filtration in one compact unit.
- Mechanical Filtration: Incoming pond water enters the inner chamber, passing through the Eazy filter filled with K1 Micro media. This captures fine particulates, suspended waste, and debris.
- Biological Filtration: After the water is mechanically cleaned, it moves into the outer chamber containing K1 Moving Bed Media. This stage supports millions of beneficial bacteria that convert harmful ammonia and nitrite into safe nitrate.
The efficient flow path ensures continuous water movement, excellent oxygenation, and highly effective waste removal—key ingredients for a healthy koi pond.
Choosing the Right Nexus Model
Choosing the correct model is essential for proper filtration. The two main Nexus models are:
- Nexus 220: Suitable for smaller koi ponds up to around 18,000 litres (4,000 gallons).
- Nexus 320: Designed for larger koi ponds up to 34,000 litres (7,500 gallons).
Heavily stocked koi ponds often require oversizing to ensure optimal water clarity and biological stability. Pairing the filter with the right pump and UV clarifier also improves performance, especially during warmer months when algae levels rise.
Installation Tips for Best Performance
Correct installation is key to getting the most from your Evolution Aqua Nexus.
- Ensure the filter is placed on a firm, level base.
- Install it gravity-fed or pump-fed, depending on your pond design.
- Use appropriately sized pipework (110 mm for gravity systems).
- Make sure water levels align correctly with the manufacturer’s guidelines.
- Provide adequate airflow to the biological chamber using a reliable air pump and diffuser.
A well-installed Nexus system offers smooth operation, efficient flow rates, and reduced maintenance frequency.
Cleaning and Maintaining the Nexus Filter
One of the standout benefits of the Nexus system is its easy maintenance. Unlike older filter designs that require dismantling, the Nexus includes a built-in cleaning system:
- Close the inlet valve.
- Stir the K1 Micro media using air.
- Open the waste valve to discharge dirty water.
- Repeat if needed.
- Reopen the inlet valve and restart the system.
This “Eazy Clean” process means you can clean your filter in minutes without disturbing the biological media in the outer chamber, keeping beneficial bacteria safe.
Benefits of Using an Evolution Aqua Nexus
The Nexus system offers several advantages that make it ideal for koi ponds:
- Exceptional water clarity
- Strong ammonia and nitrite control
- Low running costs
- Quick and simple cleaning
- Long-lasting construction
- Compatibility with Evolution Aqua pumps, UVs, and K1 media
Its efficiency and ease of use make it suitable for both beginners and experienced koi enthusiasts.
Conclusion
The Evolution Aqua Nexus Guide highlights why the Nexus remains one of the most popular koi pond filters on the market. With its innovative two-stage filtration, user-friendly cleaning system, and exceptional biological performance, it delivers the clarity and water quality koi require to thrive. Whether you’re building a new koi pond or upgrading your filtration system, the Nexus offers a reliable, high-performance solution that stands the test of time.
