I got an old aquarium set from my friend, and it has a whisper 10 filter. It only takes a 'bio bag' which is a cotton bag with carbon in it, and the product description says to replace it every month or so. Also, the product webpage says that biobag deals with chemical and mechanical filtering, but no mention on biological filtering. LFS
says just to rinse to biobag every month and keep using it (so that I keep the nitrogen related bacteria living there).
I even thought of ripping of some of the cotton from the old bio bag and put it in the new one, that way I might be able to retain some of the bacteria, but I think that might hinder the mechanical filtering capability of the biobag, so probably not a good idea.
So many opinions, I don't know what to do. Any comments?