Abstract: In a toilet comprising a toilet bowl, the water-saving system comprises a first emitter for emitting a first beam having a first wavelength comprised between 300 and 495 nm. A second emitter for emitting a second beam has a second wavelength comprised between 590 and 900 nm, at least one detector for receiving the first and second beams. The first emitter, second emitter and detector(s) are installed on the toilet such that the first beam and second beam pass through the water contained in the toilet bowl before being received by the detector(s). A controller receives and processes data from the detector(s), and the data representing the waste level in the toilet bowl. A flush volume actuator is actuated by the controller for flushing a variable volume of water as a function of the data, so as to minimize the volume of water.

Abstract: A self-adjusting control device for a flushing system mechanism borne by a stirrup and provided with pivoting arms actuated by fingers borne by pull-handles for flushing the water, the water flush control being provided via rods acting on the head of the pivoting arms, by externally accessible control knobs on the water flushing apparatus lid. The device comprises: a housing (16) containing the control knobs (19, 20), provided with a thread pitch (p1); an insert (14), integral in rotation with the housing (16) provided with a thread pitch (p2); a fitting (25) borne by the insert (14) carries the pivoting axis (26) of the arms (10, 11); the thread pitches (p1, p2) are in the ratio p1/p2 =L1/L2 of the vertical projections of the distances from the axis of the finger (33, 34) (L1) to the contact points (31, 32) of the heads (29, 30) of the arms (10, 11) and the rods (21, 22), and (L2) to the pivoting axis (26) of the arms (10, 11).