which may be a user option flush fluid enters commode 10 to function as the transport medium for the sewage waste received in the commode the flush fluid transports the waste via conduit 13 to separating tank 36 preferably through a dispersion cone 38 separating tank 36 may take the form of a section of compartmentalized tank structure 18 as shown separation of the sewage waste and the flush fluid medium takes place in separation tank 36 and flush fluid 15 due to its flotation on the waste 39 in tank 36 passes upwardly as it increases in volume preferably through a layer of chlorine tablets 40 coalescer 42 over a weir 44 through a bag filter 46 and into a reservoir tank 16 the preferred fluids for flush media contemplated for use with this invention are of themselves incapable of providing support for bacteria or viruses however a certain level of entrainment at the interface of the fluid medium and the waste in the separating tank is inevitable consequently the incorporation of an oil soluble biocide is desirable to act as a 34 scavenger 34 for entrained contamination several such biocides have been evaluated and found satisfactory for this purpose biobor j f which is manufactured by the u s borax company is a typical example as are solid trichloroisocyanuric and chlorine compounds such as those used in swimming pool chlorinators such an arrangement provides a separating tank for receiving waste being transported by the flush fluid medium the flush fluid medium 15 separating from the waste 39 upon entering the separating tank and floating on the waste due to its different specific gravity whereby an.