12 in 1 Mix Bio Balls Ceramic Rings Set Aquarium filter media 1.1 lb with 1 Zipper Mesh Bag, biological ceramic rings for efficient biological filtration and for removing toxic ammonia and nitrite. Provides a porous surface area for the growth of beneficial bacteria. Before use, rinse the filter media with water from the established aquarium.
12 in 1 Biological Filter Media includes:

Ammonia Remover: The water chestnut structure is suitable for the growth of bacterial micelles and can absorb harmful substances.
Coral Sand: Taken from natural seabed, absorb harmful bacteria, effectively nurture nitrobacter.
Biochemical Ball: Precision porous structure that provides for the nitrifying bacteria living environment, improve the filtering effect of making the water more healthy
Nano Bacterial Ring: surface is covered with micropores, higher density culture of bacteria.
Volcanic Rock: Special porous structure, adsorption of harmful substances and heavy metals, stable water quality.
Bacterial Ring: The number of surface micropores is many times that of ordinary cultured bacteria, which can rapidly decompose nitrite.
Breathing Ring: Launch powerful far infrared rays, provide a suitable living environment for living things.
Ceramic Ring: Good penetrability, unique structure is conducive to the growth of nitrifying bacteria, is a reinforced filter media.
Quartz Ball: Long-term maintenance of PH stability, improve fish death, absorption of lethal harmful Y factor.
Bacterial Ball: Promote fish metabolism and discharge harmful substances in the body, increase oxygen content in water, and activate water molecules.
Maifan Stone: Maifan stone is close to volcanic rock, can release oxygen, absorb bleaching powder and other harmful substances, and purify water.
Activated Carbon: Adsorption ability, sterilization, water purification, removal of odor