A water chlorinating device having a vessel (2) in turn having a bottom portion (6) for containing water a grille (10) located over the bottom portion and for supporting a solid chemical chlorinating substance (11) a spray device (13) for directing at least one water jet on to the grille (10) and a mixing nozzle (29) located inside the bottom portion (6), at the bottom of the vessel (2), and for agitating the water in the bottom portion (6) by means of a water jet.
