Water Booster Pump
Booster pumps are placed inline with the RO membrane to enhance the pressure of the water entering the membrane. It will supply your RO membrane with the optimal water pressure, resulting in the greatest possible water output, the best quality filtered water, and the least amount of waste water possible.
Where should you install your RO booster pump?
Usually they're hung under the RO unit to make sure the cords from the transformer and the pressure switch can reach with the pump mounted.