QD-714, QD-712, QD-721-1 are solid flake or granule products, mainly used in chemical fertilizer, chemical, metallurgy, electric power, petrochemical industry industrial circulating water sterilization and algae killing; QD-722 compound bromine-based fungicide is Liquid products are widely used in industrial circulating water, water supply and drainage, oil field reinjection, sterilization and algae elimination.