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![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5f/Reverse_Osmosis_with_Pressure_Recovery_Pump.jpg/300px-Reverse_Osmosis_with_Pressure_Recovery_Pump.jpg)
1: Sea water inflow (100%, 1 bar),
2: Sea water flow (100%, 50 bar),
3: Concentrate flow (60%, 48 bar),
4: Fresh water flow (40%, 1 bar),
5: Concentrate to drain (60%,1 bar),
A: Pressure recovery pump,
B: Osmosis unit with membrane
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/ReverseOsmosis_with_PressureExchanger.svg/300px-ReverseOsmosis_with_PressureExchanger.svg.png)
1: Sea water inflow,
2: Fresh water flow (40%),
3: Concentrate flow (60%),
4: Sea water flow (60%),
5: Concentrate (drain),
A: Pump flow (40%),
B: Circulation pump,
C: Osmosis unit with membrane,
D: Pressure exchanger