Brett (4EP & 4EG) Reduction

Brettanomyces (4EP & 4EG) Reduction


Brett is the most infamous of all wine faults, resulting in a deeply unpleasant leathery or mousey character to a wine’s smell and taste. Our Memstar machinery can not only effectively remove Brett, but also treat the undesirable Brett characters – restoring the wine to its original intended quality.

How does it work?

Brettanomyces infection can produce undesirable volatile phenols known technically as 4-ethylphenol and 4- ethyl guaiacol (4EP & 4EG). This can result in pungent, medicinal, farmyard, harsh and metallic flavours in the wine. The Memstar process can correct these faults by filtering the wine through a membrane to extract a permeate containing the undesirable compounds, passing it through a proprietary absorption media to remove them, and finally returning the treated permeate to the wine concentrate.

Benefits of Memstar Brett Reduction

  • Approx. 30% reduction in 4EP & 4EG per single pass
  • Removes Brett and Brett characters
  • No internal recirculation, ensuring quality
  • Minimal heat increase and lower pressure
  • Great mobility for all sites & needs


Memstar Mini Alcohol Reduction Service

Memstar Mini

Ideal for smaller volumes, reduces dilution and improves accuracy in up to 10,000 Litres

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Memstar Midi alcohol reduction system

Memstar Midi

Great for mid-sized volumes from 2,000 – 40,000 Litres Most versatile equipment.

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Memstar Maxi alcohol reduction system

Memstar Maxi

Most capable machine in terms of processing volume capacity from 5,000 – 500,000 litres

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Contact Us

Contact VAF Memstar today about our diverse range of filtration and processing services, available in a diverse range of capacities and mobilities.