BOYU CR-150 Ceramic rings Aquarium filter material Biological rings 150g
- Ceramic rings provide ideal surface area for beneficial bacteria colonization
- Highly porous and hollow to effectively distribute oxygenated water
- Colonies of nitrifying bacteria grow on the outside of these rings, removing toxic ammonia and nitrites
- Suitable for fresh-water, salt-water fish tank
- High permeability, which can be aerobic nitrification and anaerobic denitrification, to make the water more stable, is the best biological filter material
- 150g