The Filling degree is bot ...

The Filling degree is bot dependant on the media type that you use, the Screen system you use, the hydraulic loading to the tank and the type of aeration used.

To high filling degree can lead to media loss, dead zones and increased head loss trough the reactor.

Having worked with this Process now for more than 20 years, I can only recommend that you go to one of the renomated vendors in the market and get an offer from them.

More information on potential vendors can be found in the attached file