A fuel cell stack includes a plurality of multi-cell modules stacked and a restraining member. The compositions have a first plurality of drug-resin particles that are uncoated and a second plurality of drug-resin particles that are coated with a delayed release coating. The compensating body serves to compensate for axial tolerances of the housing andor of the filter element. Two different consoles can be powered and provide their inputs, and either console can be used to control any or all of the universes. A control valve recycles brine from the RO membrane to the hot water system during pure water production, and recirculates tap water through the RO membrane when a pure water reservoir is substantially filled. %; and removing at least a portion of the first, second, and third diluents from the multi-layer extrudate to produce the membrane.