Peritoneal dialysis system having a patient line filter

A filter set (100) comprising:

• a filtered fluid compartment (106f) including an outlet (1060);
• a filter membrane (120) positioned and arranged such that fresh PD fluid flows through the filter membrane (120) into the filtered fluid compartment (106f);
• and
• a circumferential used PD fluid channel (106c) in fluid communication with the outlet (1060), the circumferential used PD fluid channel (106c) positioned and arranged to carry used PD fluid around the filter membrane (120) without contacting, or limiting contact with, the filter membrane (120).

A method for priming a filter set (100) connected to a dual lumen patient line (50), wherein during treatment a tube (108) is located between the filter set (100) and a patient's transfer set (58), the method comprising:

• delivering fresh peritoneal dialysis (“PD”) fluid through a fresh PD fluid lumen (52) of the dual lumen patient line (50) to the filter set (100);
• forcing fresh PD fluid through a filter membrane (120) of the filter set (100), so that the fresh PD fluid displaces air towards a used PD fluid lumen (54) of the dual lumen patient line (50);
• and
• pulling used PD fluid from the patient, through the patient's transfer set (58), through the tube (108), through a used PD fluid portion of the filter set (100), and into the used PD fluid lumen (54) of the dual lumen patient line (50).