Reverse Osmosis vs. Nanofiltration

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.

  • NanofiNanofiltration wastes no water whereas reverse osmosis wastes up to 75% of the water which you’re filtering.
  • Nanofiltration uses gravity or pressure from the mains water supply to filter water while keeping a fast flow rate whereas reverse osmosis often uses electricity to pump water to order keep a fast flow rate.
  • Reverse osmosis removes important minerals from water which need to be replenished after filtration wheras nanofiltration does not require replenishment of minerals.



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