DIY External Moving Bed Reactor With Circular Flow

This moving bed reactor is the 3rd aquarium filter or pond filter model of this video:
https://youtu.be/CTizYJBAr9I

In the previous video, I use box container, but in this video, I use tube container and put the pump that way to make the water flow in circular motion. I don't know if it has impact on the filtration capacity, but I'm sure that this model use less electricity because even without airstones, the K1 media movement is good already.

aquarium filterpond filtermoving bed filter