NOVELTY - A biological agent comprises 35-65 pts. wt. silicate, 15-18 pts. wt. quicklime, 2-3 pts. wt. garlic, 15-25 pts. wt. bamboo, 20-25 pts. wt. apricot abalone mushroom fungus slag, 2-3 pts. wt. lactic acid fungus, 3-5 pts. wt. honeysuckle, 15-20 pts. wt. lactic acid bacteriophage, 15-18 pts. wt. modified corn powder, 2-3 pts. wt. wild Chrysanthemum, 8-15 pts. wt. potassium dihydrogen phosphate, 3-5 pts. wt. tobacco, 5-9 pts. wt. alum, 3-5 pts. wt. plantain herb, 5-7 pts. wt. sodium hypochlorite, and 30-45 pts. wt. fermented brewer's grain.    USE - Biological agent used for treating pond bottom sludge.    ADVANTAGE - The biological agent has simple manufacturing method that uses cheap raw materials, can eliminate pool bottom pollutants, and can rapidly eliminate heavy metals.    DETAILED DESCRIPTION - A biological agent comprises 35-65 pts. wt. silicate, 15-18 pts. wt. quicklime, 2-3 pts. wt. garlic, 15-25 pts. wt. bamboo, 20-25 pts. wt. apricot abalone mushroom fungus slag, 2-3 pts. wt. lactic acid fungus, 3-5 pts. wt. honeysuckle, 15-20 pts. wt. lactic acid bacteriophage, 15-18 pts. wt. modified corn powder, 2-3 pts. wt. wild Chrysanthemum, 8-15 pts. wt. potassium dihydrogen phosphate, 3-5 pts. wt. tobacco, 5-9 pts. wt. alum, 3-5 pts. wt. plantain herb, 5-7 pts. wt. sodium hypochlorite, and 30-45 pts. wt. fermented brewer's grain. The bamboo-wood ash is made of bamboo, wood, and corn straw at a ratio of 2:3:1 dry weight after mixed with combustion product. The fermented beer after treatment includes 20 wt.% beer grain loaded in a cylinder, added with 55 wt.% beer, and fermented for 7 days. The modified corn meal comprises 85 pts. wt. corn powder, 2.5 pts. wt. sodium hexametaphosphate, 35 pts. wt. water, 4 pts. wt. phosphoric acid, 10 pts. wt. sodium hydroxide, and 10 pts. wt. sodium bentonite. The modified corn meal is prepared by putting the corn powder in a container, and stirring, adding sodium hexametaphosphate, stirring and mixing, adding 20 pts. wt. corn flour in water, stirring for 5 minutes, standing, and dispersing for 40 minutes, adding phosphoric acid and 5 pts. wt. water into the container and stirring uniformly, standing for 30 minutes, adding sodium hydroxide and the remaining 10 pts. wt. water, stirring uniformly, standing for 45 minutes, adding sodium bentonite, and drying to obtain the modified corn meal.