1 CERAMIC PARTICLES FOR USE AS A FILTERING MEDIA FOR THE TREATMENT OF WASTE, POLLUTED WATER OR AIR INCLUDING TREATMENT OF TOBACCO FUMES; CHEMICAL PREPARATIONS USED IN FILTERING MEDIA FOR THE TREATMENT OF WASTE, POLLUTED WATER, AIR OR TOBACCO FUMES; MINERAL SUBSTANCES IN THE NATURE OF FILTERING MEDIA FOR THE TREATMENT OF WASTE, POLLUTED WATER, AIR OR TOBACCO FUMES, ABSORBING CARBONS FOR THE TREATMENT OF WASTE, POLLUTED WATER, AIR OR TOBACCO FUMES; ACTIVATED CARBONS TO BE USED AS AN ADDITIVE IN THE MANUFACTURE OF RUBBER