... With the character of good heat-storing, high hardness and infrared, it is widelyused for human healthy, water treatment, spa ... 1) Tourmaline powder can persistently release negative ions, emit far infrared ray.Hence, it can purify air, accelerate the micro- ... 3) After tourmaline negative ion powder is made into ceramic ball and ceramic brick,itcan activate, purify and mineralized tap water, treat ...