Methods and Systems for fluid balancing in a dialysis system

A dialysis system configured to balance a first amount of fluid that is removed from a patient with a second amount of fluid that is delivered to the patient during a dialysis session, wherein the dialysis system comprises:

• a dialyzer having a dialysate side and a blood side, wherein the dialysate side and blood side are separated by a material;
• a blood circuit wherein the blood circuit directs blood from a patient, through the blood side of the dialyzer, and back to the patient;
• a dialysate circuit wherein the dialysate circuit directs dialysate to the patient through the dialysate side of the dialyzer and wherein the dialysate circuit comprises:
• a fluid reservoir configured to store regenerated dialysate;
• a first dialysate pump configured to draw spent dialysate from the dialyzer;
• a second dialysate pump configured to draw the regenerated dialysate from the fluid reservoir;
• a third pump configured to draw waste fluid from the dialysate circuit;
• a first valve configured to direct a first amount of spent dialysate to a first channel of the first dialysate pump and a second amount of spent dialysate to a first channel of the second dialysate pump;
• a second valve configured to direct a first amount of regenerated dialysate to a second channel of the first dialysate pump and a second amount of regenerated dialysate to a second channel of the second dialysate pump;
• a sorbent cartridge in fluid communication with the first dialysate pump and the second dialysate pump;
• a third valve configured to aggregate spent dialysate from the first dialysate pump and the second dialysate pump into a single stream of spent dialysate and direct the single stream of spent dialysate to the sorbent cartridge;
• and
• a fourth valve configured to aggregate regenerated dialysate from the first dialysate pump and the second dialysate pump into a single stream of regenerated dialysate and direct the single stream of regenerated dialysate to the dialyzer;
• and
• a processor configured to reverse a state of the first valve, second valve, third valve, and fourth valve to reverse an action of the first dialysate pump and second dialysate pump such that, during the dialysis session, a volume of fluid that is pumped from the dialyzer equals a volume of fluid that is pumped into the dialyzer.