Originally Posted by Zagz
I personally think the ceramic rings are better as they are porous and the bacteria sticks in the holes more than with bio balls. I use both but when I rinse the bio balls they come much cleaner than the rings proving to me that they bacteria doesn't stick as well to the plastic.
ceramic rings have the potential to hold more bacteria.
However, according to the instructions, ceramic rings are supposed to be changed every 3-5 months.
Whereas bioballs NEVER need changing.