11 Water purification installations; drinking water supply installations, namely, drinking water networks, drinking water treatment installations, namely, filtration equipment for drinking water treatment, membranes for drinking water treatment, chemical dosing equipment for drinking water treatment, UV units for drinking water treatment, Advanced oxidation units for drinking water treatment, ozone units for drinking water treatment, Ion-exchange units for drinking water treatment, electro-chemical equipment for drinking water treatment; floor water fountains, water purification tanks for drinking water; sewage disposal plants; water supply installations; industrial treatment installations, namely, industrial process water treatment installations, industrial wastewater treatment installations, industrial cooling water treatment installations, namely, filtration equipment for process water, waste water and aerobic waste water treatment, membranes for process water, waste water and aerobic waste treatment, chemical dosing equipment for process water, waste water and aerobic waste water treatment, UV units for process water, waste water and aerobic waste water treatment, Advanced oxidation units for process water, waste water and aerobic waste water treatment, ozone units for process water, waste water and aerobic waste water treatment, Ion-exchange units for process water, waste water and aerobic waste water treatment, electro-chemical units for process water, waste water and aerobic waste water treatment; sand filter for process water, waste water and aerobic waste water treatment, waste water treatment tanks, drainage water treatment tanks, reverse osmosis filtration units for water treatment, membrane filtration units for waste water treatment, dissolved air floatation (DAF) units for waste water treatment; sewage treatment installations, namely, biological wastewater treatment installations, physical wastewater treatment installations, namely, aerobic (activated sludge) waste water treatment, sedimentation tanks, sand filter for waste water treatment, membrane filtration units for wastewater treatment, cloth filter units for wastewater treatment, UV units for wastewater treatment, ozone units for wastewater treatment, anaerobic and anaerobic digesters for sewage sludge treatment, thickening and dewatering machines for use in treatment of sewage; water conditioning units for conditioning drinking water; industrial installations for filtering liquids, namely, water filters, membranes for water treatment; water conditioning installations; filters for drinking water; water distribution installations, namely, irrigation water networks, drinking water networks, stormwater networks, sewage networks, namely, drainage basins, raw water collection points, aqueducts, water tunnels, water pipes, water purification facilities, water storage facilities, reservoirs, water tanks, water towers, cisterns, pumping stations, pipe networks, connections to sewers, sewer monitoring equipment, pipe monitoring equipment, stormwater storage facilities; watering machines for agricultural purposes