7
Sludge filters, filter presses, water filters, sand filters, membrane filters, cloth filters, the aforesaid filters being parts of machines; filtering machines; straining machines; separators; strainers; machines for driving components and devices in water-purifying installations; machines for removing solids from liquids and sludge; separators; water separators; separators for fats and oils; mechanical tools for the maintenance of clarifying installations and water-purifying installations; computer installations; dosing installations for chemicals; dosing installations for flocculants/auxiliary flocculating agents
11
water-purifying apparatus, machines and installations; river water-purifying apparatus, machines and installations; drinking water treatment apparatus, machines and installations; water-filtering apparatus; microfiltration installations; membrane filter installations; ultrafiltration installations; filters being parts for filtering installations; water pipes and water supply apparatus; equipment parts for drinking water storage tanks; sanitary apparatus and installations; sedimentation beds; equipment for sedimentation basins, namely inlet constructions, outlet constructions, sludge collectors
37
Construction of drinking water treatment installations, clarifying installations, sewer systems and/or wastewater purification installations; construction of electric switchboard installations; construction of electric control installations