Gas-purifying chemicals;Chemical preparations in the nature of filtering materials in the water treatment industry;Mineral substances in the nature of filtering materials in the water treatment industry;Vegetable substances in the nature of filtering materials in the water treatment industry;Water-softening preparations;Chemicals for use in purifying water;Chemicals for use in decontamination of polluted sites;Chemicals preparation,namely ion exchangers; Flocculants;Water-purifying chemicals;...