... ,its elastic effect is better , non-floating surface, pores large, head loss, the acid and ... distribution of small,it has the following advantages: high efficiency ,filtration rate ,fast, sewage interception ... hFilling density60-80kg/m3Containing sewage6-10kg/m3specific surface area3000m2/m3spherical diameter15-25,25-30mmporosity96%Ball ... fiber-ball filter of high quality and have current goods