A method of performing peritoneal dialysis includes: (i) locating a supply of fresh dialysis fluid above a patients peritoneal cavity (ii) locating a drain or a drain container below the patients peritoneal cavity (iii) connecting a supply line to the supply of fresh dialysis fluid and the patients peritoneal cavity (iv) connecting a drain line to the patients peritoneal cavity and the drain or drain container (v) pneumatically opening a supply line valve during a fill cycle (vi) gravity filling the patients peritoneal cavity with the supply line valve open during the fill cycle (vii) pneumatically opening a drain line valve during a drain cycle and (viii) draining the patients peritoneal cavity with the drain line valve open during the drain cycle.
