Apparatus, devices and installations (fixed or movable) for distributing, treating, purifying, filtering water and waste water; apparatus, devices and installations (fixed or movable) for waste water purification; apparatus, devices and installations (fixed or movable) for rendering water drinkable; apparatus, devices and installations (fixed or movable) for treating, disinfecting and 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 and settling; filters namely filters (parts of household or industrial installations) for treating water and 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