DXIA 60 Pcs Bio Balls, Bio Balls Aquarium Fish Tank Filter Bio Media, Bio Porous Filter Biochemical Ball Filter Media with Cotton for Fish Tank Pond Aquarium Waterfall Fountain, 16mm

Safe and durable: These filter medium aquariums are made of plastic, are safe, non-toxic, durable and do not change the water quality. It can help to create a pleasant living environment for aquatic life, suitable for UVC filters, external filters or filter basins in the aquarium or pond.
Practical and efficient: Each ball has a plastic construction with high-performance filling, The Black Bio-Balls have a structure of dense holes in which a lot of nitro-bacteria live. When the water flows through the interior, the time is increased by the nitrifying bacteria used to achieve the effect of biochemical filtration.
Large surface: Enhances the bacterial filtering effect, light and easy to transport. The filter balls offer a large area for bacteria and thus achieve a very high level of efficiency for natural biological filtering.
High Quality: Aquarium Filter Bio Balls, easy to flush and use which are excellent for oxygenating your water and helping the gas exchange process. Great for any freshwater or saltwater aquarium, or mini reef aquarium.
Wide range of applications: Every ball size: approx. 1.6 cm, our biochemical filter balls can not only be used in biochemical filter systems in sea water, but also in biochemical filter systems in fresh water.