Fiber ball filter is formed by the fiber yarn,compare with the traditional steel particles filter, it has the advantages of effective elastic, couldn't float in water, large pores, head loss,can resist in acid and alkali; in the filtration process,filter layer gap gradually smaller along the flow direction,more in line with the ideal filter by the big gap under the distribution of small.It has high efficiency, fast filter-speed,strong sewage capacity, renewable,applicable for kinds water’s filtering.