used for the filter 260 with the attendant benefits identified above note that the ui interface 275 and controller 270 are shared in the present embodiment by the treatment machine thus any information required for control of both the treatment and preparation of filtered replacement fluid 230 would not need to be communicated to a separate controller such as controller 270 note also that the communications among the illustrated components is provided by a channel 202 which may be wire harness separate wires a bus a wireless channel or any suitable communications power transmission device in the embodiment of fig3 a predicted quantity of replacement fluid may be filtered and stored for use during treatment if however for some reason more is required the treatment machine controller 270 could be configured to identify that situation and control the subsystem 305 components to provide it many blood treatment process employ a filter 220 to filter blood and into which replacement fluid is supplied to a patient 225 more details on preferred embodiments of the treatment machine are discussed below in either of the above embodiments the rate of flow of fluid during preparation of the batch of replacement fluid may be substantially less than the rate of consumption during treatment in an exemplary embodiment of an application for hemofiltration the amount of replacement fluid consumed is between 9 and 18 l and the rate of consumption is approximately 200 ml min for daily treatment a higher quantity of fluid is required also the media used for sterile filtration may be any suitable media that insures the quality of the replacement fluid is as desired in the embodiments discussed above it was assumed that the end sought was preparation of filtered replacement fluid employed microfiltration to prevent the passage.