The fundamental of vacuum chamber operation: Chamber type vacuum sealers create vacuum atmosphere in the vacuum chamber. By means of a pump, the air present in the room, as well as in the product packaging, is removed. This enables to remove from the packaging gases and impure particles which are present in the air, moisture and oxygen, a vital gas for man as well as for microorganisms such as bacteria and molds. Their proliferation is blocked and their metabolisms, i.e. fermentation, are inhibited. To ensure the effectiveness of such method and maintain vacuum over time, the packaging – either bag or bowl – must be properly sealed.