Higher Nature Colloidal Silver Pump Spray High Stability 100ml # SIL100Our Colloidal silver contains pure, medical grade silver, which has been used for many centuries. It is produced using electro controlled technology and pure water from a 9 stage water purification process, to achieve a very small particle size (0. 0006 to 0. 005 microns). This small particle size is important because it provides a much greater surface area and therefore more of an effective liquid. The 15ml refillable size is ideal for carrying in a