Along with the building instructions, you will also receive a detailed shopping list with all the necessary items and sources of supply.
It is a fixed-bed filter that is largely self-cleaning thanks to the use of air lift.
Furthermore, the full volume of the filter (also above the water-bearing level) is fully utilized. By pumping up the filter using an air lift onto a trickle plate, the otherwise completely unused area is also used as a trickle filter.

In my opinion, the optimal bio-filter for a private system that places high demands on the degradation rate and the associated water quality.

If this is properly integrated into an aquaponic system, you can - with optimal management - feed up to approx. 1.8kg per day.
(Provided that the other parts of the system are also set up properly).