A membrane admits a pure water flux of 120 litre/m h at a pressure differential of 110 bar. The polarization modulus is estimated to be M = 4.0, and the salt rejection is R -0.9. If the osmotic pressure of the solution is 15 bar, calculate the water and salt flux used to desalinate 4% salt solution at an applied pressure difference of 80 bar. For simplicity, the salt rejection rate may be assumed to be independent of pressure. [8M]