Water flux-refers to the water production capacity of the reverse osmosis system, that is, the amount of water permeating the membrane per unit time, usually expressed in tons/hour or gallons/day.
Salt permeation rate-the amount of salt permeated per unit time and unit membrane area, also called salt permeability and salt flux.
Recovery rate-refers to the percentage of feed water converted into product water or permeate in the membrane system. Depends on the pretreatment influent water quality and water requirements. The recovery rate of the membrane system has been determined at the time of design,
Recovery rate = (product water flow / influent flow) × 100%