Opening Pore bio ball have a reputation for being a nitrate factory,where there is no room for any anaerobic nitrate bacteria growing.but it is like as a home of for those bacteria growring,such as Nitrifying bacteria. It aim to assist in the population growth of beneficial bacteria. Owing to this ball’s material is plastic,so it is very easy to float on water surface. Unique guilding flow slot & plate will promote liquid evenly distribution. Bio-sponge inside provide more surface area for benefical bacteria growth. When Toxic water containing ammonia will flow through the Opening bio balls, Good bacteria on the surface of bio balls will break down ammonia into nitrites.Although Nitrifying bacteria attached on Opening bio ball can remove Nitrate from the aquarium water,then still you can not skip regular water changes.Therefore, bio balls should usually be used as an additional media to bio rings or bio sticks which, as discussed previously, can harbour ammonia, nitrite and nitrate eating bacteria.Most frequently used in sumps, pond filters and canister filters.