What is reverse Osmosis?

What is Reverse Osmosis?
Reverse Osmosis is the reversal of the natural flow of osmosis. In a water purification system, the goal is not to dilute a salt solution/contaminated water, but to separate the pure water from the salt and other contaminants. When the natural osmotic flow is reversed, water from the salt solution is forced through a membrane in the opposite direction by application of pressure, hence the term Reverse Osmosis.

What can be removed my Reverse Osmosis?
The most important feature of this reverse osmosis system is its membrane. The membrane consists of several layers or sheets of film that are bonded together and rolled in a spiral configuration. The size of the membrane’s pores are 0,0001 of a micron. The material of the membrane is semi-permeable. This allows water molecules pass though while acting as a barrier to dissolved solids, viruses and bacteria. The remaining contaminants are concentrated and washed from the surface of the membrane down the drain.