 He spent one season in Switzerland with the Zürcher SC, where he scored seven goals and nineteen assists.Gruth was member of the Poland men's national ice hockey team for the 1980 Olympics, 1984 Olympics, 1988 Olympics and 1992 Olympics, as well as for 17 World Championships.He holds the record for the most selection to the Polish squad, with 248, as well as the record for the most points (109).