Tecno-gaz PURA 10 BIOX Manual Del Usuario página 117

APPENDIX
Reverse osmosis is a process ensuring production of water of very high chemical and
biological quality.
In natural osmosis, between two solutions having different salt concentration and
separated by a semipermeable membrane (that is to say permeable to the solvent but
not to the solute), a so called osmotic pressure forms which tends to shift water from
the more diluted to the more concentrated solution.
The higher the salinity difference between the two solutions, the higher the pressure.
Reverse osmosis is based on a physical principle according to which by applying to the
more concentrated solution a hydrostatic pressure higher than the osmotic one, pure
water tends to go back to the more diluted solution thus reversing the natural process.
This purification system is exclusively a physical process exploiting a so called tangential
flow filtration system: the constant rejection of part of the solution having the highest
salt content in order not to excessively increase concentration.
REVERSE OSMOSIS
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