There are no filters to clean, Passing the water through the media beds cleans the water coming from the fish tank. Using a Timed Flood and Drain system will save utility costs and avoid the problems associated with bell siphons.
Enlarging the system as shown here would require two pumps but one will be used intermittently while the other will be a very small pump which will be very inexpensive to run.
Overall this system satisfies all the requirements of a reliable, low maintenance, and low energy system.
Periodically the drip holes would need to be cleaned, and of course water tests and feeding. But that's about all there is once the system is established #Aquaponic_system