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The PX Pressure Exchanger (PX) is a rotary-type energy recovery device (ERD) with only one moving part that recovers energy from the waste stream of seawater reverse osmosis (SWRO) systems at up to 98% efficiency. At the core of the device is a ceramic rotor which resists corrosion and has low vibration, providing maintenance-free and fail-safe operation. PX technology dramatically reduces costs associated with the energy intensive SWRO desalination process by up to 60% as compared to desalination plants without any energy recovery devices. It is also the most widely used ERD today with installations in over 30 countries world-wide.

What you have stated is true in regards to Energy from Waste Stream Seawater Reverse Osmosis. Reverse Osmosis certainly plays a vital role in Energy recovery devices.

Regards,
Bevis