Evolution Aqua Nexus+ Filter System – Advanced Mechanical & Biological Pond Filtration
The Evolution Aqua Nexus+ Filter System stands as one of the most trusted and celebrated pond filters in the industry.
Designed by multi-award-winning U.K. manufacturer Evolution Aqua, this system brings nearly two decades of filtration engineering into one streamlined, powerhouse unit.
If you’re chasing crystal-clear water and a healthy environment for your fish, the Nexus+ is basically the big boss of pond filtration.
Dual-Stage Filtration for Superior Water Quality
The Nexus+ combines mechanical filtration and biological filtration inside one cleverly engineered body, separating the dirty work into two dedicated chambers:
 
1. Inner Chamber – Precision Mechanical Filtration
Unfiltered pond water enters the inner chamber first, where a controlled vortex forms around the stainless steel Easy filter.
Large solids settle at the bottom (gravity doing what it does best).
Finer particles are captured by static K1 Micro media, locking away debris before it can sneak farther into the system.
This process delivers a genuinely clean mechanical breakdown before the water moves to its next stage.
 
2. Outer Chamber – High-Efficiency Biological Filtration
The outer chamber transforms into a moving bed biological filter, powered by K+ Media (with huge surface area) and an aerator pump (not included).
Here’s where the magic happens:
Aerobic bacteria grow on the K+ media
These beneficial bacteria convert ammonia, nitrates and nitrites into safe, non-toxic compounds
The churning motion + oxygen encourages maximum filtration performance
The result? Stable water parameters and healthier fish—every pond keeper’s dream.
 
Flexible Installation: Pump-Fed or Gravity-Fed
Once filtration is complete, the clean water moves into the outlet chamber and returns to your pond depending on how your system is set up:
Pump-Fed Systems: Water passes through a UVC before entering the Nexus.
Gravity-Fed Systems: Water flows out of the Nexus and into a dry-mounted pump, then through a UVC and back to the pond.
Either way, installation stays straightforward and effective—no drama, just clean water.
 
Key Benefits
Multi-stage filtration for elite water clarity
Mechanical vortex settlement + static K1 Micro media
Moving bed biological chamber with K+ Media
Supports strong beneficial bacteria populations
Works with both pump-fed & gravity-fed setups
Designed by one of the world’s leading pond filtration brands
Ideal for koi ponds and large garden ponds