11 industrial installations, and municipal waste water treatment installations, for the separation of liquids and solids, comprising - drum filters, horizontal filters, filter presses, membrane filters, liquid level control attachments for filters, filter fabrics, [ sewage ejectors, ] pumps, conditioning tanks, dissolved air flotation units, [ compressors,] thickeners, collectors, chemical feeders, [ ejector stations, ] dryers, spray dryers, [ fluid bed dryers, blenders and centrifuges ]