W.S. : " What is “reverse osmosis” in relation to wine? How and why is it used? "
" Reverse osmosis (the cool kids call it “R.O.”) is a filtration method sometimes used in winemaking. The filter is so ridiculously fine that it can separate the water and alcohol (ethanol) in the wine from the tannins, pigments and the other components that are responsible for the wine’s flavors and aromas. "