A system having a WC basket that has at least one chamber, wherein: a self-adhesive sanitary agent in gel form is present in the chamber of the WC basket and adheres to the chamber sleeve; the chamber sleeve is completely closed on at least one side, and the agent adheres to the completely closed side of the chamber sleeve; the sanitary agent has at least one non-ionic adhesion promoter; the non-ionic adhesion promoter has at least one hydrophobic functional group and also includes a hydrophilic group; and the agent is acidic.