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A semipermeable membrane is the substance used in all RO Membranes.

Water enters the human body by passing through a semipermeable membrane in the digestive track.  The Membranes used for Reverse Osmosis are synthetic semipermeable membranes which allow water to pass through but filter out most contaminants.

What is Osmosis?

Osmosis is the natural movement of water molecules from a lower to a higher concentration of salt particles through a semipermeable membrane.

However, when pressure is applied to the side of higher concentration of dissolved solids, there will be a greater amount of net movement to the lower concentration side.  This is Reverse Osmosis.

The undesirable dissolved and suspended substances will not pass through the semipermeable membrane leaving the permeate or product water 99.99% pure H2O.

For commonly used Reverse Osmosis terms click here RO TERMS

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