... 70%min High Content, Low Impurity 1,3-Dichloro-5,5-Dimethylhydantoin ( DCDMH )[ Product Name ] : 1,3-Dichloro-5,5-Dimethylhydantoin ( DCDMH ... for killing various bacteria, fungi, viruses. Hence, widely used:1. In the cultivation of aquatic organisms, such as fish, turtles ... avoiding being mixed with toxic and harmful substances with shelf life of two years. DCDMH (1,3-Dichloro-5,5-Dimethylhydantoin)