The compound microbial agent (liquid) is the original liquid produced by the reproduction of beneficial microorganisms. It is rich in a variety of amino acids, beneficial microorganisms and physiologically active substances. It can directly provide nutrients to the breeding objects and beneficial algae, and decompose the residual bait, feces and macromolecules at the bottom of the water layer. Organic matter, inhibit pathogenic bacteria, balance the pH of the water body, degrade ammonia nitrogen and nitrite in the water body, increase the amount of dissolved oxygen in the water body, and make the water body fat, live, tender and refreshing. 　　Instructions: 　　Usually half a month to 20 days before the onset of aquatic products. Use this product when the water layer is about 50 cm, splash 1-2L per mu. After 15-20 days, use the same method to pour again. 　　Storage and transportation: 　　Store in a dry, dark, rain, ventilated place, away from fire, food and children.