A dialysis system comprising: ∘ a dialyzer having a blood compartment, ∘ a blood circuit including: ▪ an arterial line having: • a first arterial end including an arterial connector intended to be connected to a patient, • a second arterial end connected to the blood compartment of the dialyzer, and • an arterial valve, ▪ an venous line having: • a first venous end including a venous connector intended to be connected to the patient, • a second venous end connected to the blood compartment of the dialyzer, and • a venous valve, and ▪ a blood pump configured to move a fluid through the blood circuit and to be actuated in at least one of a normal pump direction through the blood circuit and a reverse pump direction through the blood circuit, oppositely to the normal pump direction, and ∘ a fluid system having: ▪ a first storing compartment (19, 19") intended to store at least one of a priming solution, a solution compatible with blood and a rinsing solution, ▪ a first line in fluid communication with the first storing compartment (19, 19"), having a first valve, and connected to the blood circuit between the arterial connector and the blood pump, ▪ a second line in fluid communication with the first storing compartment (19, 19"), having a second valve, and connected to the blood circuit between the venous connector and the blood pump, ▪ a third line configured to be removably connected to at least one of the arterial connector and the venous connector, ▪ a fourth line configured to be removably connected to at least one of the arterial connector and the venous connector, and ▪ a second storing compartment (19', 33, 41) in fluid communication with the blood circuit, wherein the fourth line is in fluid communication with the second storing compartment (19', 33, 41). ∘ a dialyzer having a blood compartment, ∘ a blood circuit including: ▪ an arterial line having: • a first arterial end including an arterial connector intended to be connected to a patient, • a second arterial end connected to the blood compartment of the dialyzer, and • an arterial valve, ▪ an venous line having: • a first venous end including a venous connector intended to be connected to the patient, • a second venous end connected to the blood compartment of the dialyzer, and • a venous valve, and ▪ a blood pump configured to move a fluid through the blood circuit and to be actuated in at least one of a normal pump direction through the blood circuit and a reverse pump direction through the blood circuit, oppositely to the normal pump direction, and ▪ an arterial line having: • a first arterial end including an arterial connector intended to be connected to a patient, • a second arterial end connected to the blood compartment of the dialyzer, and • an arterial valve, • a first arterial end including an arterial connector intended to be connected to a patient, • a second arterial end connected to the blood compartment of the dialyzer, and • an arterial valve, ▪ an venous line having: • a first venous end including a venous connector intended to be connected to the patient, • a second venous end connected to the blood compartment of the dialyzer, and • a venous valve, and • a first venous end including a venous connector intended to be connected to the patient, • a second venous end connected to the blood compartment of the dialyzer, and • a venous valve, and ▪ a blood pump configured to move a fluid through the blood circuit and to be actuated in at least one of a normal pump direction through the blood circuit and a reverse pump direction through the blood circuit, oppositely to the normal pump direction, and ∘ a fluid system having: ▪ a first storing compartment (19, 19") intended to store at least one of a priming solution, a solution compatible with blood and a rinsing solution, ▪ a first line in fluid communication with the first storing compartment (19, 19"), having a first valve, and connected to the blood circuit between the arterial connector and the blood pump, ▪ a second line in fluid communication with the first storing compartment (19, 19"), having a second valve, and connected to the blood circuit between the venous connector and the blood pump, ▪ a third line configured to be removably connected to at least one of the arterial connector and the venous connector, ▪ a fourth line configured to be removably connected to at least one of the arterial connector and the venous connector, and ▪ a second storing compartment (19', 33, 41) in fluid communication with the blood circuit, wherein the fourth line is in fluid communication with the second storing compartment (19', 33, 41). ▪ a first storing compartment (19, 19") intended to store at least one of a priming solution, a solution compatible with blood and a rinsing solution, ▪ a first line in fluid communication with the first storing compartment (19, 19"), having a first valve, and connected to the blood circuit between the arterial connector and the blood pump, ▪ a second line in fluid communication with the first storing compartment (19, 19"), having a second valve, and connected to the blood circuit between the venous connector and the blood pump, ▪ a third line configured to be removably connected to at least one of the arterial connector and the venous connector, ▪ a fourth line configured to be removably connected to at least one of the arterial connector and the venous connector, and ▪ a second storing compartment (19', 33, 41) in fluid communication with the blood circuit, wherein the fourth line is in fluid communication with the second storing compartment (19', 33, 41).