Composting receptacles of plastic

waste water screening units and waste water filtration units for use in sewage treatment and industrial waste water treatment

APPARATUS FOR USE PARTICULARLY IN WASTE WATER PURIFICATION-NAMELY, INSTALLATIONS FOR HEATING AND COOLING, FLOTATION AND FLOCCULATION EQUIPMENT, SUCH AS FLOTATION APPARATUS, AERATORS, OXYGENATORS AND MIXERS, AND FILTERS FOR DISPOSAL OF SUSPENDED SOLIDS FROM LIQUIDS