A water treatment process that removes undesirable materials
from water by using pressure to force water molecules through a semipermeable
membrane. The process is called "reverse" osmosis because
the pressure forces the water to flow in the reverse direction (from
the concentrated solution to the dilute solution) to the flow direction
in natural osmosis (from the dilute solution to the concentrated).
RO removes ionized salts, colloids, and organic molecules down to a
molecular weight of 100. May also be called hyperfiltration.
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