Reverse Osmosis (RO) and Nanofiltration (Nano) are two very similar technologies that remove impurities from water or other liquids. In both systems, Membranes are used to separate a liquid from contaminants. Membranes are basically filters with tiny pores that allow water through while trapping contaminants.
Key differences between nanofiltration and reverse osmosis (RO) include:
Nanofiltration is a newer technology than reverse osmosis and was developed for drinking water applications as it was found that RO removed some of the minerals in water that are considered beneficial for human health. Nanofiltration allows beneficial minerals to pass through the membrane with the water while blocking contaminants such as heavy metals, pesticides etc that are harmful to the body.