Abstract: The present invention relates to a system used to feed WC flushing tanks (C) with recycled water collected in a tank (1) in which the water coming from the sink (L), other sanitary fittings and household appliances (LB) is drained; it being provided that, in case of absence or draining of the recycled water reserve, the same system is capable of favouring the feeding of the flushing tanks (C) with “clear” water normally supplied by the domestic water network (8).