Activated carbons for water filtering, water softening; Ceramic particles for use as a filtering media in water filtering, water softening; Chemicals for use in purification of water; Ion-exchange resin membranes; Ion-exchange resins; Mineral substances in the nature of filtering materials in water filtering; Vegetable substances in the nature of filtering materials in water filtering; Chemical products for preventing scale; Chemical solutions in the nature of multimetal corrosion and scale i...