Batch-operated reverse osmosis system with multiple membranes in a pressure vessel

A reverse osmosis system comprising:

• a fluid reservoir having feed fluid therein;
• a first input valve;
• a second input valve;
• a first brine feed tank in fluid communication with the fluid reservoir through the first input valve, said first brine feed tank comprises an upper flow distribution plate and a lower flow distribution plate, said first brine feed tank in fluid communication with an inlet to a pressure vessel above the upper flow distribution plate, said brine outlet of the pressure vessel in fluid communication with the brine feed tank below the lower flow distribution plate;
• a second brine feed tank in fluid communication with the fluid reservoir through the second input valve;
• said first brine feed tank and said second brine feed tank having brine feed fluid therein;
• said high pressure pump;
• a pressure vessel in fluid communication with the fluid reservoir through the high pressure pump, said pressure vessel comprising a permeate outlet and a reverse osmosis membrane, said pressure vessel having a brine outlet;
• said first brine feed tank and said second brine feed tank in fluid communication with the pressure vessel;
• during a first permeate production cycle, said first brine feed tank providing brine fluid to the pressure vessel and said high pressure pump pumping additional feed fluid under high pressure from the fluid reservoir into the pressure vessel, said pressure vessel communicating brine fluid into the first brine feed tank or the second brine feed tank;
• said high pressure pump raising a pressure in the pressure vessel until a first amount of permeate is produced from a permeate output of the pressure vessel;
• during a second permeate production cycle, said second brine feed tank providing brine fluid to the pressure vessel and said high pressure pump pumping additional feed fluid under high pressure from the fluid reservoir into the pressure vessel, said pressure vessel communicating brine fluid into the first brine feed tank or the second brine feed tank;
• said high pressure pump raising the pressure in the pressure vessel until a second amount of permeate is produced from the permeate output of the pressure vessel.