Nanofiltration is a process that uses specialized membranes to filter out specific types of impurities from water, including those that are too small to be filtered by reverse osmosis membranes. Unlike reverse osmosis, which can remove most dissolved salts and minerals, nanofiltration is able to target specific types of ions and molecules.

The membranes used in nanofiltration are similar to those used in reverse osmosis, but they have smaller pores that allow for the filtration of smaller particles. Typically, nanofiltration membranes have a pore size of between 1 and 10 nanometers, which allows them to filter out ions like calcium, magnesium, and sulfate, as well as other impurities like bacteria and viruses, that are too small to be filtered by reverse osmosis membranes.

Nanofiltration is often used in conjunction reverse osmosis tell me what you have