The various levels of filtration

Ultrafiltration – 0.01 μm

Ultrafiltration is a filtering system that uses microporous membranes. These membranes are called “low pressure” because of their transmembrane pressure  around 0.2 to 2 bar.

For drinking water, ultrafiltration is characterized by a cutoff threshold to the order of 0.01 microns. All larger molecules are stopped (pollen, algae, parasites, bacteria, viruses, germs and large organic molecules), ultimately supplying perfectly clarified and disinfected water without using chemicals.

Reverse osmosis – 0.0001 μm

The membrane used in RO is a semipermeable membrane. It is composed of two filter layers. The principle of RO is that water charged with salts, viruses, bacteria, organic matter … is injected through the membrane under high pressure, thanks to a pump. Due to a difference in osmotic pressure, the water is filtered by the membrane which makes it drinkable. The impurities are rejected during this process by a sweeping flow.