Place of Origin : Jiangmen,China

* Material:PP

* Color : Black

* Suitable for trickle-type filter

* Principle of work : when the water flow runs through the surface of bio ball,the water flow will change the direction along the grooves,run in another bio ball and change the direction again,again and again to extend the time of flow,promote the exchange of the air in the water,increase the content of the oxygen and extend the actions of nitrifying bacteria in order to improve the biological filtration efficiency and