Does nothing against virus...Have no idea why they have the temerity to state so...Test HAVE been done and a lecture on the subject delivered to HOGA here in Hawaii...TSP in strong solution is the only chemical currently in use that was verified..Of course there are others..but it was noted that tests have verified some efficiency using it...NOT physan...(P.S.) that is what we are told...If the makers can prove it, let the test results be shown...Bill _______________________________________________ the OrchidGuide Digest (OGD) [EMAIL PROTECTED] http://lists.orchidguide.com/mailman/listinfo/orchids