A descaling capsule (6) in particular for descaling an undermounted spray device (1) for a bidet toilet, comprising: a hollow body (14) having a cavity (12) and a descaling means (24) arranged in the cavity (12), wherein the cavity (12) comprises, arranged at the first end (20) of the hollow body (14), a first opening (22), a second opening (23) and first coupling means (25) which are releasably engageable with second coupling means (4) at a front end (8) of a nozzle (2), and the descaling capsule (6) comprises closure means (30) which are releasably attached to the hollow body (14) and which close the first and second openings (22, 23) and can be removed before the descaling capsule (6) is used.
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