Chlorinated water treatment apparatus (15), comprising: - a reservoir (11) and a plug (12), arranged to define a predetermined closed volume intended to receive chlorinated water (15) to be treated, - at least a light source (21) arranged to expose the predetermined closed volume to ultraviolet radiation with a wavelength ranging from 320 nm to 400 nm and preferably from 325 nm to 395 nm, - a housing (30) arranged to receive the reservoir (11) closed with the cap (12), preferably reversibly, characterized in that the housing (30) has a wall: - which comprises an interface for fixing said at least one light source ( 21), and- which comprises means for cooling said at least one light source (21). Figure for the abstract: Fig. 1
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