Evolution Aqua K1 Media
Moving Bed Biological Filter Media for Ponds & Koi Systems
Available in 1 L, 3 L, 25 L & 50 L
 
Evolution Aqua K1 Media is the industry-standard biological media for moving bed filtration, proven through more than a decade of scientific use in fish farming and wastewater treatment.
Now widely adopted in koi and ornamental pond systems, K1 delivers highly efficient, self-cleaning biological filtration with exceptional reliability.
Exclusively distributed worldwide by Evolution Aqua.
 
Why K1 Media Is the Benchmark
Scientifically proven moving bed process
Self-cleaning biological filtration
Massive protected surface area for nitrifying bacteria
Extremely stable water quality
Virtually maintenance free once established
This is one of the most trusted biological filtration methods available.
 
How the K1 Moving Bed Process Works
K1 media is engineered in a wheel-shaped design
It is slightly positively buoyant, allowing it to stay in suspension
An air pump with air stones or diffusers creates constant movement
The continuous motion:
Prevents clogging
Sloughs off dead bacteria
Keeps the media clean and oxygen-rich
This creates the ideal environment for beneficial nitrifying bacteria to convert ammonia and nitrite efficiently.
 
Designed for Maximum Biological Efficiency
High protected surface area inside each K1 piece
Excellent oxygen transfer
Constant renewal of bacterial biofilm
Rapid response to increased fish load or feeding
Perfect for high-stock koi ponds and heavily fed systems.
 
Typical Applications
Moving bed biological chambers
Koi ponds
High-stock ornamental ponds
Fish holding systems
Aquaculture and professional installations
Often used after mechanical filtration such as sieves or drum filters.
 
Installation Notes
Requires an air pump and diffuser
Media should be filled to approx. 50–60% of chamber volume
Allow time for bacterial colonisation before full stocking
Once established, maintenance is minimal.
 
Available Sizes
1 litre – small upgrades or top-ups
3 litres – small chambers or additions
25 litres – standard pond installations
50 litres – large systems and moving bed filters
 
Bottom Line
Evolution Aqua K1 Media is a proven, professional-grade biological filtration solution. If you want stable water parameters, low maintenance, and a system that scales effortlessly with fish load, K1 remains one of the most effective and trusted choices available for moving bed filtration.