i have to rinse my filters ( HOB ) about twice a month, which is due to my overstocking.
i have bio screen ( which is almost like brillo pad )
and 2 filters pads, the fill your own carbon filters. i just dont put carbon in anymore
ive only been carbon free for about 2 months
but my tanks are great
and i havent had to change any pads on my 20gal for awhile. but when it starts falling apart ill replace it
and ill still have 2 filters with good bacteria.
i offset the non brillo filters so ill always have at least 2 forms of good bacteria media
hope this helps