How Does Repour Work So Well? From The Manufacturer... The science behind Repour is simple. By putting our oxygen-absorbing material in the Repour stopper, we are able to continuously remove the oxygen from the air above the wine in the bottle, and from the wine itself, bringing the level of oxygen in the air down below 0.05% and the dissolved oxygen in the wine to less than 0.03 ppm (that's pretty much removing ALL the oxygen)! By removing all the oxygen, we completely STOP the wine degradation process. Other wine preservation products, such as wine pumps and wine vacuum pumps, use air displacement, which reduces the oxygen, but doesn't eliminate it. That is why these other products only keep your wine fresh for a few more days. With Repour, the next time you want to enjoy your wine, whether it is days, week, or even months later, it will be so fresh you may even want to let it "open up" again. We say cheers again and again to that! Instead of throwing out a bottle of wine that has gone bad, or messing with complex, expensive, and not so effective contraptions, simply insert the wine "stopper" in place of the bottle's original cork, and preserve the wine for the life of the opened bottle. Your favorite wine, simply saved and perfectly preserved.