... : 1,3-Dichloro-5,5-Dimethylhydantoin ( DCDMH )[ Formula ] : C5H6O2N2Cl2[ M.W ] : 197.04[ Properties ] : White crystal powder, slightly soluble in ... 5%[ Usage ] : Mainly as antiseptic and alga-kiling agent for killing various bacteria, fungi, viruses. Hence, widely used:1. ... as fish, turtles, shrimps,crabs,frogs, shellfish etc., for preventing and treating diseases caused by bacteria, fungi, viruses ...