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Double-cistern water-conserving sanitary water tank

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A double-cistern water conservation sanitary water tank comprises two tanks: an external oval tank (9) for evacuating solid waste and an internal round tank (8) for flushing liquid waste mounted within and at a level above a bottom wall of the external oval tank (9), and two actuating handle for operating the tanks. The external oval tank (9) includes a water entrance valve (3) and an elbow-shaped water outlet (4) having one end connected to a first outlet valve (11) inside the external oval tank (9). The internal round tank (8) includes a water entrance valve (1) and a vertical water outlet (2) having one end connected a second outlet valve (10), an intermediate portion connected to the second end of the elbow-shaped water outlet (4), and the other end forming a common drain (7).

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