The present invention generally relates to methods and apparatus for processing substrates. A current closed thermal cycle used in electric power stations requires both heat source and cooling source. The size of the virtual logical unit corresponds to an estimated size of raw data which, being compressed, would substantially amount to a size of the storage logical unit. Dispersions of inorganic pigments prepared in the presence of the acrylic acid polymer or the aqueous solution of the acrylic acid polymer are also provided. The liquid is separated from the gaswater mixture. Applicant has discovered a synergistic combination of the two components with the ration of cationic biocide to quaternary ammonium being less than 1:10 or with a single quaternary compound in a ratio of less than 1.