The fiber ball filter material is made of fiber. Compared with the traditional steel particle filter material, it has the advantages of good elastic effect, no floating surface, large gap, long working period and small head loss. In the filtration process, the gap of the filter layer gradually becomes smaller along the flow direction, which is more in line with the ideal filter material. The filter material has the advantages of high efficiency, fast filtration speed (20-85m / h), large sewage interception capacity, good filtration effect, renewable, air and water backwashing, and the flushing water volume is 1-2% of the filtering water volume. It is suitable for filtration of various water quality. The filling height of the fiber ball filter material is 120cm, and the fiber ball filter material will naturally decrease by about 30cm after water inflow.