Evolution Aqua K1 MICRO Moving Bed Filter Media 50/100L
K1 MICRO Moving bed filter media from Evolution Aqua.
Choose amount required from dropdown
50 litres
100 litres (2 bags of 50L)
How it works
Maturing the Kaldnes bio-media is important because a delicate eco-system is naturally developing for the bacteria involved in the nitrification process.
Kaldnes media provides the maximum active surface area for the bacteria to colonise, more than other types of static media. It is this process which removes harmful ammonia and nitrite from the water.
How it is different to other media
As the Kaldnes media moves within the filter, it causes the old dead bacteria on the outside to be flushed out, allowing new, active bacteria to colonise the surface. This continuous movement promotes a healthier and more efficient biological filter.
| Capacity | 50L or 100L (2 x 50L) |
|---|---|
| Filter Type | Moving Bed |
| Function | Nitrification – removes ammonia and nitrite |
| Bio-media Surface Area | Maximum active surface area for bacterial growth |
FAQ
How long does it take for the K1 MICRO media to mature?
The maturation process typically takes 2 to 4 weeks. During this time, bacteria colonise the media and establish an effective nitrification system. It is recommended to run the filter with a small amount of water and avoid adding fish during the initial phase.
Can I mix K1 MICRO with other types of filter media?
It is not recommended to mix K1 MICRO with static media as the moving bed design is optimized for consistent bacterial activity. Using only K1 MICRO ensures the best performance in nitrification.
Is the media safe for use in freshwater aquariums?
Yes, the K1 MICRO media is specifically designed for freshwater aquariums and is safe for use in both planted and fish-only systems.

Joan Jones –
The filter media works well in my 50L tank. After a few weeks, ammonia levels dropped significantly. The water clarity improved and my fish seem more active. I noticed the media needs a few weeks to fully mature, but once it’s active, it’s very reliable.
Stephanie Springer –
I bought two 50L bags for my 100L tank. The moving design helps keep the bacteria fresh. I had to wait about three weeks before seeing noticeable improvement in water quality. It’s a bit more expensive than static media, but the performance is worth it.
Jacob Lee –
After switching from a static filter to this moving bed system, my tank has been much more stable. The bacteria colonization is consistent and the ammonia spikes are gone. I recommend it for anyone serious about water quality.