ADA Bio Rio Biofiller for external filter
I finally bought this Biofiller, eight liters!
Bio Rio is a substrate, the basis of biological filtration.
Due to the fact that the substrate has already been "sprayed" by the manufacturer with cysts of microorganisms and bacteria, biological filtration will begin to function as quickly as possible.
The filler granules are mainly pumice with a very porous surface.
It is this porous surface that will become an excellent home for numerous colonies of bacteria in the future.