Natural stone stone can not play a role in purifying water, but can increase the minerals in the water, its main component is a mineral known as "microcrystalline chert", the most strontium, calcium oxide, followed by silicon oxide, sodium oxide, etc., as well as aluminum, iron, magnesium, phosphorus and other elements, trace elements and rare earth elements containing chromium, manganese, nickel, copper, yttrium and other more than 36 kinds of beneficial elements to the human body. elements, and the content of radioactive substances is extremely small.