Bacterial preparations, other than for medical and veterinary use; bacteriological preparations, other than for medical and veterinary use; bromine for chemical purposes; hydrogen; hypochlorite of soda; diagnostic preparations, other than for medical or veterinary purposes; diatomaceous earth; test paper, chemical; reagent paper, other than for medical or veterinary purposes; ion exchangers [chemicals]; ceramic materials in particulate form, for use as filtering media; oxygen for industrial p...