Jack Zhang, (Global Doctor, medical official)

　　According to national stipulated terms, the sources of water applied to be mineral water must go through a process of fifty-four norms, one-year period of time of dynamic monitoring, hygiene norms and other restrictive norms are qualified, and in the meantime, more than one or one limited norms is qualified and signed certificates after supervision by the departments of minerals ， hygiene and technique, thus it is named mineral water. In general, more than two or two norms are qualified, it could be called high-quality mineral water. The RainSong mineral water series, especially the strong strontium 、 bitter salt bearing mineral water, exploited by Depen Group in Sichuan Province recent yeas has the content of metasilicate about ninety percent , the quality of which is so high that is scarce in the international market.
　　The quality of RainSong series mineral water, especially the strong strontium bitter salt bearing mineral water, exploited by Depen Group in Sichuan Province could be compared favorably to that of the famous brand home and abroad wide and it works even better in medic and heath care. Named by foreign experts as “Liquor Centrum” , it has drawn attention from areas such as Europe, America, Australia, New Zealand and so on and has been signed contracts for export.

　　Professor Sun Chenjun, an expert of hygiene inspection bureau and analytics, professor of School of Public Health West China Medical Center University.

　　In order to reach the high-quality standard, the mineral water is appraised from all aspects, which begins from the choice of source of water that is carefully evaluated by geological experts. When found, on-spot investigations and light sensitivity appraisals are made strictly including the color and taste of the water, besides peculiar content of the water are examined and the number of bacteria is controlled to limited scope. The RainSong series mineral Water is advantageous over national standard and deserve recommendation.

　　Long Ji Wu, hydro-geologist

　　In recent years, a lot of beverage of different brand such as Purified water, Outer space water ， Mountain spring water, Distillated water coming into the market, which in fact is how to evaluate according national standard, are all one kind of resources of liquid minerals that comes from the cycling underground water, in which a lot of mineral salt and trace elements are included. In an ordinary situation, its chemical composition, flow capacity, temperature and some other dynamics remain comparatively stable and get its own particular condition for producing. The mineral elements in water could do medic and health care functions to people's health. One applied to exploit natural mineral water must do hydro geological research and evaluation and submit relevant report qualifying the appraisal made by evaluation groups of departments of national minerals ， hygiene and technique according to the GB8537-1995 standard of People's Republic of China on mineral water, thus it is named mineral water and certified exploitation of mineral resources by national land resource bureau.