To provide a material treating system capable of efficiently absorbing microwaves into the material and of efficiently performing the separation or sterilization, of the inclusions in the material.

Microwave separation treating means 96 of a flocculation accelerating equipment 73 has three reactors 1 by which the microwaves of respective frequencies 10.6 GHz, 12 GHz, and 13 GHz are respectively oscillated and a conducting pipe 2 in which treated water is conducted is arranged in the central segments of the respective reactors 1 in such a manner that the microwaves are made incident within a range of 35° to 43° on the treated water.