Apparatus, devices and installations (fixed or movable) for distributing, treating, purifying, filtering water, waste water; apparatus, devices and installations (fixed or movable) for softening, demineralizing water; apparatus, devices and installations (fixed or movable) for waste water purification; apparatus, devices and installations (fixed or movable) for plants for rendering water drinkable; apparatus, devices and installations (fixed or movable) for treating, disinfecting, filtering slurry; apparatus, devices and installations (fixed or movable) for treating, disinfecting waste in the context of household, municipal or industrial applications; apparatus, devices and installations (fixed or movable) for treating and purifying water including clarification, flocculation, settling and/or removal of carbonates; filters, especially filters (parts of household or industrial installations) for rendering water drinkable; rotating biological contactors for treating water, waste water and slurry; apparatus, devices and installations (fixed or movable) for purifying urban and industrial water