A filler station for a packaging installation for packaging a substance in containers, the station having a filler spout having a spout body with a bottom end provided with an orifice fitted with a controlled delivery valve. The spout is provided with at least one suction channel extending in the bottom end of the spout body between the outside of the filler station and the inside of the spout body so as to open out inside the spout body above the orifice. An associated installation and method.