The invention relates to a diffusor for adding of gases into water, said diffusor comprising a perforated tube (1) and at least one supply tube (2), said the at least one supply tube (2) is at one end coupled to a source for supplying gas and at the other end in fluid communication with the perforated tube (1), the gas is supplied to the perforated tube (1) through at least one inner supply tube (4 5 15 ) extending from the supply tube(2) to the perforated tube (1). The invention is distinctive in that at the least one inner supply tube (4 5 15) is a non-perforating tube and hasat least one outlet (4a, 5a, 15a) situated at a free end of the at least one inner supply tube (4, 5, 15), said gas is adapted to be distributed into the perforated tube (1) through the at least one outlet (4a, 5a, 15a).Linvention concerne un diffuseur permettant dajouter des gaz dans leau, ledit diffuseur comprenant un tube perforé (1) et au moins un tube dalimentation (2), ledit tube dalimentation (2) est couplé au niveau dune extrémité à une source dalimentation en gaz et est en communication fluidique avec le tube perforé (1) au niveau de lautre extrémité, le gaz est fourni au tube perforé (1) à travers au moins un tube dalimentation interne (4 5 15) sétendant entre le tube dalimentation (2) et le tube perforé (1). Linvention est caractérisée par le fait que ledit tube dalimentation interne (4 5 15) est un tube non perforant et a au moins un orifice de sortie (4a, 5a, 15a) situé au niveau dune extrémité libre dudit tube dalimentation interne (4, 5, 15), ledit gaz est adapté pour la distribution dans le tube perforé (1) au travers dudit orifice de sortie (4a, 5a, 15a).
