The size and number of {HEAD ~ modules} in {TAIL ~ each set} and the flow configuration is dependent upon the degrees of concentration achieved, the permeate fluxes attained through the membrane, and module cost 
The size and number of { HEAD ~ modules } in { TAIL ~ each set } and the flow configuration is dependent upon the degrees of concentration achieved , the permeate fluxes attained through the membrane , and module cost
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH