A filtering system for continuous renal replacement therapies having an inlet (I； I1, I2) for the fluid to be treated, namely blood, and an outlet (U) for the treated fluid； the filtering system (1； 201； 301) has a blood circuit (2； 202； 302) with a plurality of treatment seats (30； 30I, 30II) interposed between the inlet (I； I1, I2) and the outlet (U)； each treatment seat (30) is connected to the inlet (I； I1, I2) through a respective delivery branch (8； 208； 308)； each treatment seat (30) is connected to the outlet (U) through a respective outlet branch (11)； the filtering system (1； 201； 301) has a regulation assembly (9), which selectively regulates the fluid flow through each treatment seat (30； 30I, 30II).
