The filtration or pasteurisation step is added to either physically remove live microorganisms from the product or simply kill them with heat. This helps to prevent food spoilage and extend shelf-life. Think of a long-life/UHT milk. However, the health benefits of kvass actually come from the live microorganisms present in each can! At Quas, our goal is to make products of the highest quality while giving the priority to human health, even if it comes at a cost of a shorter shelf-life