11 Apparatus, devices and installations for water treatment, water supply, water purification and water quality control, namely, water treatment units, [ water supply units, ] water purifying units, [ water quality control units, ] water treatment tank, water purifiers, filters; apparatus, devices and installations for urban and industrial wastewater purification, namely, wastewater purification units and installation; activated sludge tanks; apparatus, devices and installations for water filtration, in particular using membranes, namely, water filtering installations, water filtering units using membranes, water filtering units using membranes filter cartridges; filters and membranes as part of domestic or industrial installations, for water or sludge treatment and/or purification; membrane biological reactor, namely, bioreactor for use in the treatment of water and wastewater