We believe in staying true to the traditional Pilsner brewing process, which does not include pasteurization. (Pasteurization is a heat process used to extend shelf life of food products, but we don't like the effects heat has on the beer's taste). Instead, we use a 3 step filtration process to ensure quality and consistency in every batch of beer we brew. In addition, we diligently monitor our date codes to ensure that only the freshest Steam Whistle is being served at all times.