Today, in the field of water desalination, the REVERSE OSMOSIS is one of the most advanced processes, which is more and more frequently adopted. This process, which reverses the natural sequence of the osmosis present in the living environment around us and in all biological systems, consists in the spontaneous turning of a pure solvent into a more concentrated solution through a semipermeable membrane.

In the REVERSE OSMOSIS this process is reversed applying a certain pressure on the concentrated solution. In practice the semipermeable membranes, made of a synthetic material and packaged in well-distinct units and modules, are the tools, which make this process possible.

The water to be treated enters the module with a sufficient pressure, lapping the membranes. One part of the water passes through these latter and then, free of salt (permeated), it is collected in the central tube, while the remaining water, which is obviously more concentrated (rejection), pours out of the module, after running through it axially.

If the feedwater contains substances, which might decrease the performance or damage the modules, a pretreatment, especially designed by MARETTO ENGINEERING experts, will be applied before the R.O. (Reverse Osmosis) unit.



The success obtained by an advanced technology able to reduce the production costs like the REVERSE OSMOSIS, is an excellent mental spur to extend the application field of this process and in general of the Separation Systems to all those sectors listed below, which require a pure water and want to have a reliable reply about it:

• Nautical sector (conditioning)
• Civil sector (conditioning and bathroom/kitchen)
• Processing sector
• Food sector
• Chemical – pharmaceutical – cosmetic sector
• Electronic sector
• Medical – sanitary sector
• Farm and breeding sector

Reverse osmosis plant installed in a dialysis department – Mombasa civil hospital – flow per hour: 2 m3

Reverse osmosis plant applied to brackish water for the production of mineral water – flow per hour: 100 m3