This Colloidal Silver is made using electro-controlled technology & a 9-stage water purification process, to achieve a very small particle size (0.0006 to 0.005 microns), providing a much greater surface area for contact & a far more effective product. Tastes like water, safe, even on small children. The 15ml refillable size, with handy funnel, is ideal for carrying in a bag or pocket.