The AntiOx Stopper from Pulltex protects your wine up to 10 days after opening the bottle. The patented system contains an active carbon filter that prevents the oxidation of the wine inside the bottle. Once a wine bottle is closed with the AntiOx Stopper, the oxidation of wine is interrupted and the oxygen comes no longer in contact with the wine. This prevents the production of acetic acid that damages the wine with an unpleasant smell and a taste of vinegar. For optimal performance, please keep the bottle in vertical position. The active carbon filter will function at least for 5 years without losing performance. The active carbon filter cannot be replaced.