#$%^&*AU2013231142A120131010.pdf#####ABSTRACT A synergistic antimicrobial composition comprising: (a) ortho-phenylphenol or its alkali metal or ammonium salts and (b) hexahydro-1,3,5-tris(2-hydroxyethyl)-s-triazine wherein a weight ratio of ortho-phenylphenol or its alkali metal or ammonium salts to hexahydro-1,3,5-tris(2-hydroxyethyl)-s-triazine is from 15:1 to 1:15.