An RO plant of 250 m/day production capacity is using a positive displacement pump for pressurizing seawater into the RO membranes to produce fresh water. The plant recovery is 35% and seawater salinity is 38500 ppm. Due to the increase in the water demand, this plant is required to be upgraded/or replaced in order to meet the new water demand, which was expected to reach 400 m/day. Suggest the best ways for achieving the new required water demand and justify your answer. [10 marks]