Osmosis is the reason why drinking salty water is deadly. If you were to you drink salty water and have it go into your stomach, the osmotic pressure begins to draw the water out of your body to try to dilute the salt in your stomach and eventually you start to dehydrate and could possibly die.
The purified or pure water is collected from the clean side, or permeate side, of the membrane and on the other side is the water containing the concentrated contaminants which is flushed down the drain.
The reverse osmosis system removes salt and most inorganic materials that are present in the water. For this reason it is used in places where you find brackish or salty type water that contains nitrates or other dissolved minerals which are difficult to remove by other methods. It also removes the minerals from the water.
De-mineralized water contains more hydrogen and therefore, The reverse osmosis system is an acid solution where the pH is below seven. Consuming this acid substance causes our body to pull minerals from other sources, such as our teeth and bones to produce bicarbonate in an effort to neutralize the acid. This can be very negative. It has been proven that the production of free radicals goes up when body fluids are more acid than alkaline and this increases our risks for cancer.
All of our fresh water contains traces of minerals such as calcium, magnesium and potassium. I am not aware of any location on this planet earth where we can locate naturally occurring de-mineralization in the water. This makes me believe that we are meant to have these minerals.
 
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