SeaWater desalinator design RO 250m3 - 550m3 per day

We are looking for an Engineer who can help us design SeaWater desalinators Someone who can calculate the pumps sizes, flow rates for feed, brine and permeates. And also help with a 50%-75% recovery subsystem At the moment i have a 215L per hour HIGH Pressure pumps with 3 8040 double vessel membranes and 1 8040 single vessels membrane This will be our first system, and i can always get more pressure vessels to add to the system if needed for high permeate flow The goal is the most fresh water permeate as possible Regards Matt