Stainless steel water pipes have excellent hygienic performance, eliminating the problems of red water, blue-green water, and hidden water. The precipitation of stainless steel metal elements is less than 5% of the standard value stipulated by the WHO and the European Drinking Water Directive (the two standards are referenced in the regulations of countries around the world). In fact, stainless steel itself has the characteristics of safety, non-toxicity and good cleanliness. It has been fully proved by the history of successful application of stainless steel in various fields of human health for decades, and it has become a well-known fact. Stainless steel is not only used in food industries such as beverages, dairy products, brewing, pharmaceuticals, tableware, cooking utensils for a long time, and has become a standard material in these industries, but also widely used in various brackets, artificial joints, internal steel nails, etc. for material safety and cleanliness Medical human implants with high performance requirements have become the standard semiconductor industry cleaning material in clean rooms. With the continuous improvement of people’s requirements for water quality and the increasingly strict laws, regulations and standards for the release of pollutants in water pipes, the pipes for transporting high-quality drinking water are not stainless steel.