the reversible pumping chambers 51 52 turning to fig6 a cycler 60 is illustrated with a chamber 61 for accommodating the drain container 13 and a chamber 62 for accommodating the dialysate container 11 each chamber 61 62 is equipped with an integrated valve assembly and pressure sensor shown at 63 64 in the embodiment 60 shown in fig6 the chamber 61 must be capable of being evacuated dialysate may flow from the dialysate container 11 by way of gravity or pressure fill again the sensors of the valve assembly sensor combinations 63 64 monitor the intraperitoneal pressure of the patient 12 as discussed above in the embodiment 70 illustrated in fig7 the dialysate container 11 and drain container 13 are both connected to integrated control valves and pressure sensors 71 72 each of the integrated control valves and pressure sensors 71 72 are connected to lumens 73 74 respectively which are connected to the catheter 75 a by way of a y connection the details of all the y connections and clamps are not shown but are known to those skilled in the art flow from the dialysate container 11 to the patient is carried out under the gravitational head shown at 75 while flow from the patient to the drain container 13 is carried out under the gravitational head shown at 76 fig8 illustrates one in line pressure sensor 80 that is suitable for use with the present invention redundant load cells 81 82 are connected to the flexible pressure sensing membrane 83 by a vacuum connected by the line 84 85 a lumen connecting the cycler to the patient is shown at 86 fig9 illustrates a dual pumping chamber cassette 87 which includes an output line.