1 bio ball,filter media

The bio-balls have a structure of dense holes where live a lot of nitro-bacteria.These bacteria can not only improve the effect of bio-filtering but also stabilized the water quality.

!)different size of bio ball, pure bio ball and sponge inside bio ball

2)large area for the growth of nitrobacteria

3)welcome to fresh water and sea water farm

2.we have different size of bio ball:32mm,42mm,48mm,26mm,36mm,46mm,56mm,76mm