The present invention provides a subsea separation system for separating a product stream, comprising: a bulk separation unit (1), an oil polishing unit (2), and a water polishing unit (3), the bulk separation unit (1) comprises an inlet (4) for the product stream, a first outlet (5) for a water phase, a second outlet (6) for an oil phase, and a third outlet for a gas phase (15); the oil polishing unit (2) comprises an inlet (7), a first outlet (8) for a clean oil phase, and a second outlet (9) for a reject stream, and the inlet is in fluid communication with the second outlet (6) of the bulk separation unit (1); the water polishing unit (3) comprises an inlet (11) in fluid communication with the first outlet (5) of the bulk separation unit, a first outlet (12) for a reject stream, and a second outlet (13) for a clean water phase, wherein a first conduit connects the second outlet (9) of the oil polishing unit upstream of, or to, the water polishing unit (3), and a second conduit connects the first outlet (12) of the water polishing unit upstream of or to, the oil polishing unit (2), and wherein the first and/or second conduit comprises a pressurizing device (14, 16) for increasing the pressure of a reject stream.
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