ESWE−Institute for Water Research and Water Technology, Söhnleinstrasse 158, D-65201 Wiesbaden, Germany, DVGW−Technologiezentrum Wasser, Karlsruher Strasse 84, D-76139 Karlsruhe, Germany, and Institute for Water Research GmbH, Zum Kellerbach 46, D-58239 Schwerte, Germany(At 2002-07-25)
