NOVELTY - Water purifying agent comprises flocculation purifying agent, microbial purifying agent and prepared enzyme, where flocculation purifying agent comprises 4-16 pts. wt. polyaluminium chloride, 4-16 pts. wt. polypropylene amide, 2-12 pts. wt. ferrous sulfate and 3-16 pts. wt. aluminum sulfate, microbial purifying agent comprises 0.5-2.0 pts. wt. nitrogen bacteria powder, 0.4-1.5 pts. wt. Paracoccus denitrificans powder, 0.2-1.2 pts. wt. Pseudomonas aeruginosa powder, 0.2-0.8 pts. wt. Candida lipolytica powder and 0.2-0.8 pts. wt. Bacillus megaterium powder.    USE - Water purifying agent used for purifying waste tire recycling sewage (claimed).    ADVANTAGE - The water purifying agent is safe, and has purifying effect, no secondary pollution and fast water purifying speed.    DETAILED DESCRIPTION - Water purifying agent comprises flocculation purifying agent, microbial purifying agent and prepared enzyme, where flocculation purifying agent comprises 4-16 pts. wt. polyaluminium chloride, 4-16 pts. wt. polypropylene amide, 2-12 pts. wt. ferrous sulfate and 3-16 pts. wt. aluminum sulfate, microbial purifying agent comprises 0.5-2.0 pts. wt. nitrogen bacteria powder, 0.4-1.5 pts. wt. Paracoccus denitrificans powder, 0.2-1.2 pts. wt. Pseudomonas aeruginosa powder, 0.2-0.8 pts. wt. Candida lipolytica powder and 0.2-0.8 pts. wt. Bacillus megaterium powder, and prepared enzyme comprises 0.1-1.2 pts. wt. pectinase enzyme, 0.2-0.6 pts. wt. dehydrogenase, 0.1-0.8 pts. wt. phosphodiesterase, 0.1-0.6 pts. wt. oxidoreductase and 0.1-0.6 pts. wt. xylanase. An INDEPENDENT CLAIM is included for a method for treating water, which involves:    (A) adding flocculating agent in water of sewage and then stirring the obtained material at a speed of 10-20 revolutions per minutes for 0.2-1 hour;    (B) keeping the stirred material for 2-5 hours and then adding the obtained material withpolyaluminium chloride, polypropylene amide, ferrous sulfate and aluminum sulfate;    (C) discharging the upper layer clean water and then removing the bottom layer of pollutant;    (D) adding microbial purifying agent in the upper layer clean water and then stirring for 0.2-1 hour;    (E) keeping the stirred material for 2-5 hours and then adding the obtained material with rest of the components; and    (F) stirring the obtained material at a speed of 10-20 revolutions per minutes for 0.2-1 and then keeping the stirred material for 3-8 hours to obtain the desired product.