A solution infusion apparatus (1), particularly for dialysis systems, comprising at least one main pouch (3, 3) adapted to contain a solution and comprising a pump (5) configured for introducing the solution in the blood circuit of a dialysis system. The apparatus further comprises at least one additional pouch (7) that is hydraulically connected to the at least one main pouch (3, 3), wherein the pump (5) is configured to draw the solution from the at least one additional pouch (7).