The present invention relates to a treatment diffusion device, for an artificial pool type pool, comprising a floating housing (10), a compartment (40) placed inside the housing, and a cover (30) for access to the compartment. , said compartment receiving at least one solid treatment element (60) which releases, by dissolution, an active agent in the water of the basin through openings (41,112) made in the compartment and in the housing. The device comprises a sliding rod (50) passing through the cover and resting on the treatment element, or on the bottom of the compartment in the absence of treatment element, said sliding rod protruding from said cover by a height H which decreases as the processing element dissolves.
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