Reverse osmosis

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A reverse osmosis system
A – Applied pressure
B – Seawater in
C – Particles
D – Membrane
E – Clean water out
F – Distribution

Reverse osmosis is how you can get small particles out of water by forcing it through a filter (a membrane). The particles in the water are left on the other side of the sheet, while the water travels through it. This is best known as a process used for purifying salt water, but it can also be used to purify other substances.