With the Memstar AA reverse osmosis and perstractive
membrane process, wine alcohol is selectively reduced
while flavors, colors and tannin are preserved. The process is a “closed loop” with two membrane barriers between the wine being treated and the strip water which removes the alcohol. The actual alcohol stripping step is performed on reverse osmosis permeate which contains very little of the precious
wine characters that would otherwise be lost. Wine to be treated is separated by reverse osmosis into concentrate and permeate streams.

Alcohol passes through the membrane from the permeate into the water. The dealcoholised permeate is then recombined with the wine from which it was extracted, thus lowering the alcohol of the blend. Typically, with one ‘pass’ the alcohol is reduced by 1 to 2% v/v.