Along with that info, they also said to use champane bottles with the plastic stoppers and wire baskets. I do know for a fact that if your fermentation is not quite done and you bottle your apple wine with a little back sweetening that your corks do not stay in the bottles. The two that were, I cooled them down and was a very good sparkling wine. Will try not to do that again unless it is on purpose. lol Arne.