The RO device is an equipment to purify the saline water with the action of pressure difference of semi-permeable membrane. It is called reverse osmosis, as it is counter to natural penetration direction. Different materials have different osmotic pressures. The RO method adopting large osmotic pressures is for the purpose to separate, extract, purify, also can remove 97% of the resolvable saline in the water and over 99% of glues, microbe, particulate and organic substances, ect.

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