Double-stage reverse osmosis equipment with only 1 water pump is okay

Double-stage reverse osmosis equipment with only 1 water pump can not. Reverse osmosis system consists of a 5μ filter, 2 high pressure pumps and pressure vessels and reverse osmosis membrane. The first stage of reverse osmosis device RO according to the 2:1 arrangement, using six 8-inch membrane tandem arrangement, water production is m3 / h, recovery rate of 75%. The second stage reverse osmosis device RO according to 1:1 arrangement, using three 8-inch membrane tandem arrangement, water production is m3 / h, recovery rate of 85%. The first stage of the membrane element to choose Hydrogen's low-pressure composite membrane CPA3, the second stage to choose Hydrogen's ultra-low-pressure composite membrane ESPA2 (selected ESPA3 membrane).