Cellulose acetate (CA) and thin-film composite (TFC) membranes are the most often used membranes in Reverse Osmosis (RO) system filters. Filtration capacity and chlorine resistance are the primary distinctions between the two types. Only chlorinated water can be treated by TFC / TFM membranes, which remove all common pollutants and are less vulnerable to organic pollution. Therefore, a carbon pre-treatment filter with a TFC / TFM membrane should be used when cleansing chlorinated tap water.

There are three layers present in a RO system filter:

• A polyester cloth layer of 100–200 m.
• An intermediate layer of polysulfide or polyether sulfone (PSF) of 30–50 m.
• A top layer of polyamide (PA) or polyetherimide (PEI) has been assisted by PSF.

A transparent membrane can be created by using a transparent composite using electrospinning nanofibers contained in an optically clear medium. The high optical transmission of electrospinning polymeric nanofibers mesh can also be achieved with a hold, thin layer of transparent material.