Water purification apparatus for biological waste water treatment; plastic biofilm modules for biological waste water treatment in fixed film reactors and mass transfer between liquids and gases; parts and fittings for the aforesaid goods, included in this class, heat exchangers (not machine parts), moisture exchangers, exchange elements and inserts for cooling towers, splash deflectors for cooling towers, inserts for filtering air and water, gas scrubbers, ventilating apparatus and equipment, humidifiers for conditioning air and gases, evaporation coolers

Plastics in extruded form for use in manufacture; plastic substances, semi-processed, used in manufacturing parts for waste water clarifying installations, drinking water treatment installations, air humidifying apparatus and installations, refrigerating apparatus and installations and cooling towers, storage and seepage installations for rainwater or waste water, namely filling materials in foil form; foil of regenerated cellulose, for filters used in aquaculture, for mass transfer and mass transfer columns, and for air/exhaust gas purification, and for air humidifying