Filtered through multiple layers of volcanic rock, 16 Jeju is a premium volcanic water from the Jeju island of South Korea. This is the most popular water sold in South Korea. At the base of the Halla Mountain, clear fresh rainwater slowly seeps though 16 layers of porous volcanic rock, picking up minerals and nutrients that contribute to a healthy immune system such as potassium, calcium, and magnesium. 16 Jeju also contains vanadium which fights disease, and silica which fights aging. These minerals give 16 Jeju its clear, clean taste with a just a hint of sweetness. The island of Jeju was formed through volcanic eruptions thousands of years ago, creating a series of underground aquifers. These reservoirs are being continuously renewed by the heavy rainfall that South Korea is known for. In addition, the area is surrounded by two vast national parks, protecting the integrity of the source water.