A detailed study of water and draw solute transport through FO membranes is presented. Flux tests were performed using CTA and TFC membranes in both orientations using four draw solutes (NaCl, Na2SO4, MgCl2, MgSO4). Fluxes were modeled using a novel model and using an FO-only approach. The membrane permeability coe-cients and structural parameter w...