seramis for grindal worms dangerous? December 3, 2017 at 10:59 pm #9418 Dorothee Jöllenbeck-PfeffelParticipant O.k. Calium also seems to me not to be too dangerous… and I washed the seramis very clean…. Any other ideas here? Perhaps I am again the only one who worries about this? 😉