11 Lighting, heating, steam generating, cooking, cooling, drying, ventilating and water conducting equipment as well as sanitary systems, in particular sewage pre-treatment apparatus and devices, separators for organic and inorganic light-density material and medium-density material as well as coarse and/or suspended matter and suspended matter mixtures, purification and waste disposal systems and devices, sewage treatment apparatus and devices, sewage plants, sewage basins, sieves for sewage technology, grating for sewage technology, rates for sewage technology, filters for sewage technology, removal, floatation, precipitation and neutralisation devices; cocks and control fittings; thermostats, ventilators; Lighting, heating, steam generating, cooking, cooling, drying, ventilating and water conducting equipment as well as sanitary systems, in particular sewage pre-treatment apparatus and devices, separators for organic and inorganic light-density material and medium-density material as well as coarse and/or suspended matter and suspended matter mixtures, purification and waste disposal systems and devices, sewage treatment apparatus and devices, sewage plants, sewage basins, sieves for sewage technology, grating for sewage technology, ates for sewage technology, filters for sewage technology, removal, floatation, precipitation and neutralisation devices; cocks and control fittings; thermostats, ventilators