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Question: What are they talking about with using the term reverse osmosis in making wine?
Answer: Yes all rather confusing. Reverse osmosis is a process of filtration that uses pressure on a liquid going through a porous fine membrane. It is a technique used for producing pure safe drinking water. Reverse Osmosis first became popular in the eighties as a technique in making wine that supposedly helps flavour concentrations while lowering the alcohol levels. Not old style natural wine making and somewhat controversial. Popularized by winemaker consultant Michel Rolland from Bordeaux together with micro-oxygenation.
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