Weight-based peritoneal dialysis system including a drain trolley

A peritoneal dialysis system comprising:

• a weigh scale;
• a valve;
• a disposable set including:
• a plurality of fluid supply containers arranged one on top of the other and fluidly connected in series, wherein the plurality of fluid supply containers are removably positioned on the weigh scale such that the bottom-most fluid supply container resides most closely to the weigh scale,
• a fluid supply line in fluid communication with the bottom-most fluid supply container, and
• a drain line positioned to operate with the valve;
• a peristaltic pump positioned and arranged to pump fresh dialysis fluid via the fluid supply line;
• and
• a control unit in communication with the weigh scale, the valve, and the peristaltic pump, wherein the control unit is configured to:
• receive an initial weight value from the weigh scale,
• activate the pump to initiate a fill phase,
• deactivate the peristaltic pump to terminate the fill phase,
• open the valve to initiate the drain phase, and
• close the valve to terminate the drain phase.