Ultrafiltration has a pore size of about 0.01 microns. Nanofiltration weighs in at just 0.001 microns. Reverse osmosis filters, which are installed under the sink or on the countertop, use a ...

One area of research has explored the integration of different membrane processes, such as microfiltration, ultrafiltration, nanofiltration, and reverse osmosis, to recover polyphenols from winery ...